利用公式法计算，初二数学，计算，急急急急急急 100道八年级上数学计算题附答案 急急急急急急急急（人教版）
\u521d\u4e8c\u6570\u5b662.3\u8fd0\u7528\u516c\u5f0f\u6cd5\u5b66\u6848\u4e0b\u518c\u516b\u5e74\u7ea7\uff0c\u62dc\u6258\u5404\u4f4d\u5927\u54e5\u5927\u59d0\u4e86\uff0c\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\u6025\uff0c\u8c22\u8c22\u5404\u4f4d\u6570\u5b661.\uff08a+b\uff09²=a²+2ab+b²\uff1b\uff082\uff09\uff08a-b\uff09²=a²-2ab+b²
\u6839\u636e\u4e0a\u9762\u5f0f\u5b50\u586b\u7a7a\uff1a
\uff081\uff09a²-b²=(a+b)(a-b)\uff0c(2)a²-2ab+b²=\uff08a-b\uff09²\u3002\uff083\uff09a²+2ab+b²=\uff08a+b\uff09²
2.\u89c2\u5bdf\u4e0b\u5217\u5f0f\u5b50\u54ea\u4e9b\u662f\u5b8c\u5168\u5e73\u65b9\u5f0f\uff1f\u89e3\uff1a\uff083\uff09\uff084\uff09
\uff081\uff09x²-4y² \uff082\uff09x²+4xy-4y² \uff083\uff094m²-6mn+9n² \uff084\uff09m²+6mn+9n²
3.\u5224\u65ad\u6b63\u8bef\uff1a
\uff081\uff09x²+y²=\uff08x+y\uff09² \uff08 \u00d7 \uff09
\uff082\uff09x²-y²=\uff08x-y\uff09² \uff08 \u00d7 \uff09
\uff083\uff09x²-2xy-y²=\uff08x-y\uff09² \uff08 \u00d7 \uff09
\uff084\uff09-x²-2xy-y²=\uff08x+y\uff09² \uff08 \u00d7 \uff09
4.\u4e0b\u5217\u591a\u9879\u5f0f\u4e2d\uff0c\u54ea\u4e9b\u662f\u5b8c\u5168\u5e73\u65b9\u5f0f\uff1f\u8bf7\u628a\u5b8c\u5168\u5e73\u65b9\u5f0f\u7684\u591a\u9879\u5f0f\u5206\u89e3\u56e0\u5f0f
\uff081\uff09x²-x+1/4 \uff082\uff099a²b²-3ab+1 \uff083\uff091/4m²+3mn+9n² \uff084\uff09x\u7684\u516d\u6b21\u5e42-10x\u76845\u6b21\u5e42+25
\u89e3\uff1a\uff081\uff09x²-x+1/4=\uff08x-1/2)² \uff083\uff091/4m²+3mn+9n² =(1/2m+3n)²
5.\u628a\u4e0b\u5217\u5404\u5f0f\u5206\u89e3\u56e0\u5f0f
\uff081\uff09m²-12mn+36n² =\uff08m-6n)²
\uff082\uff0916a\u76844\u6b21\u5e42+24a²b²+9b4\u6b21\u5e42=(4a²+3b²)
\uff083\uff09-2xy-x²-y²=-(x+y)²
\uff084\uff094-12\uff08x-y\uff09+9\uff08x-y\uff09²=[2-3(x-y)]²=(2-3x+3y)²
1) 66x+17y=3967
25x+y=1200
\u7b54\u6848\uff1ax=48 y=47
(2) 18x+23y=2303
74x-y=1998
\u7b54\u6848\uff1ax=27 y=79
(3) 44x+90y=7796
44x+y=3476
\u7b54\u6848\uff1ax=79 y=48
(4) 76x-66y=4082
30x-y=2940
\u7b54\u6848\uff1ax=98 y=51
(5) 67x+54y=8546
71x-y=5680
\u7b54\u6848\uff1ax=80 y=59
(6) 42x-95y=-1410
21x-y=1575
\u7b54\u6848\uff1ax=75 y=48
(7) 47x-40y=853
34x-y=2006
\u7b54\u6848\uff1ax=59 y=48
(8) 19x-32y=-1786
75x+y=4950
\u7b54\u6848\uff1ax=66 y=95
(9) 97x+24y=7202
58x-y=2900
\u7b54\u6848\uff1ax=50 y=98
(10) 42x+85y=6362
63x-y=1638
\u7b54\u6848\uff1ax=26 y=62
(11) 85x-92y=-2518
27x-y=486
\u7b54\u6848\uff1ax=18 y=44
(12) 79x+40y=2419
56x-y=1176
\u7b54\u6848\uff1ax=21 y=19
(13) 80x-87y=2156
22x-y=880
\u7b54\u6848\uff1ax=40 y=12
(14) 32x+62y=5134
57x+y=2850
\u7b54\u6848\uff1ax=50 y=57
(15) 83x-49y=82
59x+y=2183
\u7b54\u6848\uff1ax=37 y=61
(16) 91x+70y=5845
95x-y=4275
\u7b54\u6848\uff1ax=45 y=25
(17) 29x+44y=5281
88x-y=3608
\u7b54\u6848\uff1ax=41 y=93
(18) 25x-95y=-4355
40x-y=2000
\u7b54\u6848\uff1ax=50 y=59
(19) 54x+68y=3284
78x+y=1404
\u7b54\u6848\uff1ax=18 y=34
(20) 70x+13y=3520
52x+y=2132
\u7b54\u6848\uff1ax=41 y=50
(21) 48x-54y=-3186
24x+y=1080
\u7b54\u6848\uff1ax=45 y=99
(22) 36x+77y=7619
47x-y=799
\u7b54\u6848\uff1ax=17 y=91
(23) 13x-42y=-2717
31x-y=1333
\u7b54\u6848\uff1ax=43 y=78
(24) 28x+28y=3332
52x-y=4628
\u7b54\u6848\uff1ax=89 y=30
(25) 62x-98y=-2564
46x-y=2024
\u7b54\u6848\uff1ax=44 y=54
(26) 79x-76y=-4388
26x-y=832
\u7b54\u6848\uff1ax=32 y=91
(27) 63x-40y=-821
42x-y=546
\u7b54\u6848\uff1ax=13 y=41
(28) 69x-96y=-1209
42x+y=3822
\u7b54\u6848\uff1ax=91 y=78
(29) 85x+67y=7338
11x+y=308
\u7b54\u6848\uff1ax=28 y=74
(30) 78x+74y=12928
14x+y=1218
\u7b54\u6848\uff1ax=87 y=83
(31) 39x+42y=5331
59x-y=5841
\u7b54\u6848\uff1ax=99 y=35
(32) 29x+18y=1916
58x+y=2320
\u7b54\u6848\uff1ax=40 y=42
(33) 40x+31y=6043
45x-y=3555
\u7b54\u6848\uff1ax=79 y=93
(34) 47x+50y=8598
45x+y=3780
\u7b54\u6848\uff1ax=84 y=93
(35) 45x-30y=-1455
29x-y=725
\u7b54\u6848\uff1ax=25 y=86
(36) 11x-43y=-1361
47x+y=799
\u7b54\u6848\uff1ax=17 y=36
(37) 33x+59y=3254
94x+y=1034
\u7b54\u6848\uff1ax=11 y=49
(38) 89x-74y=-2735
68x+y=1020
\u7b54\u6848\uff1ax=15 y=55
(39) 94x+71y=7517
78x+y=3822
\u7b54\u6848\uff1ax=49 y=41
(40) 28x-62y=-4934
46x+y=552
\u7b54\u6848\uff1ax=12 y=85
(41) 75x+43y=8472
17x-y=1394
\u7b54\u6848\uff1ax=82 y=54
(42) 41x-38y=-1180
29x+y=1450
\u7b54\u6848\uff1ax=50 y=85
(43) 22x-59y=824
63x+y=4725
\u7b54\u6848\uff1ax=75 y=14
(44) 95x-56y=-401
90x+y=1530
\u7b54\u6848\uff1ax=17 y=36
(45) 93x-52y=-852
29x+y=464
\u7b54\u6848\uff1ax=16 y=45
(46) 93x+12y=8823
54x+y=4914
\u7b54\u6848\uff1ax=91 y=30
(47) 21x-63y=84
20x+y=1880
\u7b54\u6848\uff1ax=94 y=30
(48) 48x+93y=9756
38x-y=950
\u7b54\u6848\uff1ax=25 y=92
(49) 99x-67y=4011
75x-y=5475
\u7b54\u6848\uff1ax=73 y=48
(50) 83x+64y=9291
90x-y=3690
\u7b54\u6848\uff1ax=41 y=92
(51) 17x+62y=3216
75x-y=7350
\u7b54\u6848\uff1ax=98 y=25
(52) 77x+67y=2739
14x-y=364
\u7b54\u6848\uff1ax=26 y=11
(53) 20x-68y=-4596
14x-y=924
\u7b54\u6848\uff1ax=66 y=87
(54) 23x+87y=4110
83x-y=5727
\u7b54\u6848\uff1ax=69 y=29
(55) 22x-38y=804
86x+y=6708
\u7b54\u6848\uff1ax=78 y=24
(56) 20x-45y=-3520
56x+y=728
\u7b54\u6848\uff1ax=13 y=84
(57) 46x+37y=7085
61x-y=4636
\u7b54\u6848\uff1ax=76 y=97
(58) 17x+61y=4088
71x+y=5609
\u7b54\u6848\uff1ax=79 y=45
(59) 51x-61y=-1907
89x-y=2314
\u7b54\u6848\uff1ax=26 y=53
(60) 69x-98y=-2404
21x+y=1386
\u7b54\u6848\uff1ax=66 y=71
(61) 15x-41y=754
74x-y=6956
\u7b54\u6848\uff1ax=94 y=16
(62) 78x-55y=656
89x+y=5518
\u7b54\u6848\uff1ax=62 y=76
(63) 29x+21y=1633
31x-y=713
\u7b54\u6848\uff1ax=23 y=46
(64) 58x-28y=2724
35x+y=3080
\u7b54\u6848\uff1ax=88 y=85
(65) 28x-63y=-2254
88x-y=2024
\u7b54\u6848\uff1ax=23 y=46
(66) 43x+50y=7064
85x+y=8330
\u7b54\u6848\uff1ax=98 y=57
(67) 58x-77y=1170
38x-y=2280
\u7b54\u6848\uff1ax=60 y=30
(68) 92x+83y=11586
43x+y=3010
\u7b54\u6848\uff1ax=70 y=62
(69) 99x+82y=6055
52x-y=1716
\u7b54\u6848\uff1ax=33 y=34
(70) 15x+26y=1729
94x+y=8554
\u7b54\u6848\uff1ax=91 y=14
(71) 64x+32y=3552
56x-y=2296
\u7b54\u6848\uff1ax=41 y=29
(72) 94x+66y=10524
84x-y=7812
\u7b54\u6848\uff1ax=93 y=27
(73) 65x-79y=-5815
89x+y=2314
\u7b54\u6848\uff1ax=26 y=95
(74) 96x+54y=6216
63x-y=1953
\u7b54\u6848\uff1ax=31 y=60
(75) 60x-44y=-352
33x-y=1452
\u7b54\u6848\uff1ax=44 y=68
(76) 79x-45y=510
14x-y=840
\u7b54\u6848\uff1ax=60 y=94
(77) 29x-35y=-218
59x-y=4897
\u7b54\u6848\uff1ax=83 y=75
(78) 33x-24y=1905
30x+y=2670
\u7b54\u6848\uff1ax=89 y=43
(79) 61x+94y=11800
93x+y=5952
\u7b54\u6848\uff1ax=64 y=84
(80) 61x+90y=5001
48x+y=2448
\u7b54\u6848\uff1ax=51 y=21
(81) 93x-19y=2
86x-y=1548
\u7b54\u6848\uff1ax=18 y=88
(82) 19x-96y=-5910
30x-y=2340
\u7b54\u6848\uff1ax=78 y=77
(83) 80x+74y=8088
96x-y=8640
\u7b54\u6848\uff1ax=90 y=12
(84) 53x-94y=1946
45x+y=2610
\u7b54\u6848\uff1ax=58 y=12
(85) 93x+12y=9117
28x-y=2492
\u7b54\u6848\uff1ax=89 y=70
(86) 66x-71y=-1673
99x-y=7821
\u7b54\u6848\uff1ax=79 y=97
(87) 43x-52y=-1742
76x+y=1976
\u7b54\u6848\uff1ax=26 y=55
(88) 70x+35y=8295
40x+y=2920
\u7b54\u6848\uff1ax=73 y=91
(89) 43x+82y=4757
11x+y=231
\u7b54\u6848\uff1ax=21 y=47
(90) 12x-19y=236
95x-y=7885
\u7b54\u6848\uff1ax=83 y=40
(91) 51x+99y=8031
71x-y=2911
\u7b54\u6848\uff1ax=41 y=60
(92) 37x+74y=4403
69x-y=6003
\u7b54\u6848\uff1ax=87 y=16
(93) 46x+34y=4820
71x-y=5183
\u7b54\u6848\uff1ax=73 y=43
(94) 47x+98y=5861
55x-y=4565
\u7b54\u6848\uff1ax=83 y=20
(95) 30x-17y=239
28x+y=1064
\u7b54\u6848\uff1ax=38 y=53
(96) 55x-12y=4112
79x-y=7268
\u7b54\u6848\uff1ax=92 y=79
(97) 27x-24y=-450
67x-y=3886
\u7b54\u6848\uff1ax=58 y=84
(98) 97x+23y=8119
14x+y=966
\u7b54\u6848\uff1ax=69 y=62
(99) 84x+53y=11275
70x+y=6790
\u7b54\u6848\uff1ax=97 y=59
(100) 51x-97y=297
19x-y=1520
\u7b54\u6848\uff1ax=80 y=39
102²－98²＝﹙102＋98﹚﹙102－98﹚＝200×4＝800
25×101²－99²×25＝25×﹙101²－99²﹚＝25×﹙101＋99﹚﹙101－99﹚＝25×200×2＝10000
(1) 平方差公式 原式=（102-98）（102+98）=4x200=800
(2)提取公因式和平方差公式
原式=25x(101^2-99^2)=25x(101-99)(101+99)=25x2x200=10000
一百加二的平方减一百减二的平方，再开方，
绛旓細绗竴棰橈細锛坢+n锛²-锛4n锛²=锛坢+n+4n锛夛紙m+n-4n锛=锛坢+5n)锛坢-3n锛夌浜岄锛歺^4-锛2x锛²y²+y^4=锛坸²锛²-4x²y²+锛坹²锛²=锛坸²锛²-2x²y²+锛坹²锛²-2x²y²=...
绛旓細锛1锛墄^2-(1+2鏍瑰彿3锛墄+鏍瑰彿3-3=0 (1+2鏍瑰彿3)鏂-4(鏍瑰彿3-3)=1+12+4鏍瑰彿3-4鏍瑰彿3+12 =25 X1=(1+2鏍瑰彿3+5)/2=3+鏍瑰彿3 X2=(1+2鏍瑰彿3-5)/2=-2+鏍瑰彿3 锛2锛墄^2-(鏍瑰彿3+鏍瑰彿2锛墄+鏍瑰彿6=0 (鏍瑰彿3+鏍瑰彿2)鏂-4鏍瑰彿6 =3+2+2鏍瑰彿6-4鏍瑰彿6 =(鏍瑰彿3-鏍瑰彿2)鏂 ...
绛旓細锛1锛塧²-1/25b²=(a+b/5)(a-b/5)锛2锛9a²-4b²=(3a+2b)(3a-2b)锛3锛墄²y-4y =y(x²-4)=y(x+2)(x-2)锛4锛-a^4+16 =16-a^4 =(4+a²)(4-a²)=(4+a²)(2+a)(2-a)(5)15a^3+10a^2 =5a²(3a+2...
绛旓細鍥炵瓟锛氶厤鏂瑰悗寰楀埌: (x+1)^2+(y-4)^2=0 鐢变簬(x+1)^2鈮0 (y-4)^2鈮0 鍥犳x=-1 y=4 y/x=-4
绛旓細鍥炵瓟锛(1) 骞虫柟宸鍏紡 鍘熷紡=(102-98)(102+98)=4x200=800 (2)鎻愬彇鍏洜寮忓拰骞虫柟宸叕寮 鍘熷紡=25x(101^2-99^2)=25x(101-99)(101+99)=25x2x200=10000
绛旓細鍏紡娉鏄竴绉嶆暟瀛﹁В棰樻柟娉曪紝瀹鍒╃敤鐗瑰畾鐨鏁板鍏紡鏉ョ畝鍖璁＄畻杩囩▼銆備互涓嬫槸鍑犱釜甯歌鐨勫叕寮忔硶渚嬪瓙锛1. 骞虫柟宸叕寮忥細\(a^2 - b^2 = (a + b)(a - b)\)銆2. 瀹屽叏骞虫柟鍏紡锛歕(a^2 \pm 2ab + b^2 = (a \pm b)^2\)銆傛敞鎰忥細杩欎釜鍏紡閫傜敤浜庝笁椤瑰紡锛屽叾涓湁涓ら」鍙互琛ㄧず涓轰袱涓暟鐨勫钩鏂...
绛旓細36*锛坸+y锛夌殑骞虫柟-49*锛坸-y锛夌殑骞虫柟 =[6(x+y)]²-[7(x-y)]²=[6(x+y)+7(x-y)][6(x+y)-7(x-y)]=(13x-y)(-x+13y)=-(13x-y)(x-13y 锛坸-1锛+b鐨勫钩鏂*锛1-x锛=(x-1)-b²(x-1)=(x-1)(1-b²)=(x-1)(1+b)(1-b)锛坸鐨...
绛旓細)+(b²-2bc+c²)+(c²-2ac+a²)=0 (a-b)²+(b-c)²+(c-a)²=0 骞虫柟澶т簬绛変簬0锛岀浉鍔犵瓑浜0锛岃嫢鏈変竴涓ぇ浜0锛屽垯鑷冲皯鏈変竴涓皬浜0锛屼笉鎴愮珛 鎵浠ヤ笁涓兘绛変簬0 鎵浠-b=0,b-c=0,c-a=0 a=b,b=c锛宑=a 鎵浠=b=c 鎵浠ユ槸绛夎竟涓夎褰 ...
绛旓細(2)鍘熷紡=[锛坅²+b²)+2ab][锛坅²+b²)-2ab]=(a²+2ab+b²)(a²-2ab+b²)=(a+b)²(a-b)²(3)鍘熷紡=[(x²-2x)+1]²=(x²-2x+1)²=[(x-1)²]²=(x-1)^4 ...
绛旓細鍥炵瓟锛(x2-2x+1)-25=0,(x-1)2-25=0,(x-1+5)(x-1-5)=0,(x+4)(x-6)=0,x=-4鎴杧=6
