七年级 下册 数学计算题 七年级下册数学计算题和答案
\u4e03\u5e74\u7ea7\u4e0b\u518c\u6570\u5b66\u8ba1\u7b97\u9898\u5e26\u7b54\u68481) 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
18x+23y=2303
74x-y=1998
\u7b54\u6848\uff1ax=27 y=79
44x+90y=7796
44x+y=3476
\u7b54\u6848\uff1ax=79 y=48
76x-66y=4082
30x-y=2940
\u7b54\u6848\uff1ax=98 y=51
67x+54y=8546
71x-y=5680
\u7b54\u6848\uff1ax=80 y=59
42x-95y=-1410
21x-y=1575
\u7b54\u6848\uff1ax=75 y=48
47x-40y=853
34x-y=2006
\u7b54\u6848\uff1ax=59 y=48
19x-32y=-1786
75x+y=4950
\u7b54\u6848\uff1ax=66 y=95
97x+24y=7202
58x-y=2900
\u7b54\u6848\uff1ax=50 y=98
)42x+85y=6362
63x-y=1638
\u7b54\u6848\uff1ax=26 y=62
85x-92y=-2518
27x-y=486
\u7b54\u6848\uff1ax=18 y=44
79x+40y=2419
56x-y=1176
\u7b54\u6848\uff1ax=21 y=19
80x-87y=2156
22x-y=880
\u7b54\u6848\uff1ax=40 y=12
91x+70y=5845
95x-y=4275
\u7b54\u6848\uff1ax=45 y=25
29x+44y=5281
88x-y=3608
\u7b54\u6848\uff1ax=41 y=93
25x-95y=-4355
40x-y=2000
\u7b54\u6848\uff1ax=50 y=59
54x+68y=3284
78x+y=1404
\u7b54\u6848\uff1ax=18 y=34
48x-54y=-3186
24x+y=1080
\u7b54\u6848\uff1ax=45 y=99
36x+77y=7619
47x-y=799
\u7b54\u6848\uff1ax=17 y=91
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
62x-98y=-2564
46x-y=2024
\u7b54\u6848\uff1ax=44 y=54
79x-76y=-4388
26x-y=832
\u7b54\u6848\uff1ax=32 y=91
63x-40y=-821
42x-y=546
\u7b54\u6848\uff1ax=13 y=41
69x-96y=-1209
42x+y=3822
\u7b54\u6848\uff1ax=91 y=78
85x+67y=7338
11x+y=308
\u7b54\u6848\uff1ax=28 y=74
78x+74y=12928
14x+y=1218
\u7b54\u6848\uff1ax=87 y=83
39x+42y=5331
59x-y=5841
\u7b54\u6848\uff1ax=99 y=35
29x+18y=1916
58x+y=2320
\u7b54\u6848\uff1ax=40 y=42
40x+31y=6043
45x-y=3555
\u7b54\u6848\uff1ax=79 y=93
47x+50y=8598
45x+y=3780
\u7b54\u6848\uff1ax=84 y=93
45x-30y=-1455
29x-y=725
\u7b54\u6848\uff1ax=25 y=86
11x-43y=-1361
47x+y=799
\u7b54\u6848\uff1ax=17 y=36
33x+59y=3254
94x+y=1034
\u7b54\u6848\uff1ax=11 y=49
89x-74y=-2735
68x+y=1020
\u7b54\u6848\uff1ax=15 y=55
94x+71y=7517
78x+y=3822
\u7b54\u6848\uff1ax=49 y=41
28x-62y=-4934
46x+y=552
\u7b54\u6848\uff1ax=12 y=85
75x+43y=8472
17x-y=1394
\u7b54\u6848\uff1ax=82 y=54
41x-38y=-1180
29x+y=1450
\u7b54\u6848\uff1ax=50 y=85
22x-59y=824
63x+y=4725
\u7b54\u6848\uff1ax=75 y=14
95x-56y=-401
90x+y=1530
\u7b54\u6848\uff1ax=17 y=36
93x-52y=-852
29x+y=464
\u7b54\u6848\uff1ax=16 y=45
93x+12y=8823
54x+y=4914
\u7b54\u6848\uff1ax=91 y=30
21x-63y=84
20x+y=1880
\u7b54\u6848\uff1ax=94 y=30
48x+93y=9756
38x-y=950
\u7b54\u6848\uff1ax=25 y=92
99x-67y=4011
75x-y=5475
\u7b54\u6848\uff1ax=73 y=48
(x^4-2x²+1\uff09\u00f7(x²+2x+1)
\u7b54\u6848\uff1a(x-1)²
\u671b\u91c7\u7eb3
x²+y²=(x+y)²-2xy=7
2.（a+b）（a²-ab+b²）=a³+b³
3.（x-y）（x²+xy+y²）=x³-y³
4（a+b+c）²=a²+b²+c²+2ab+2bc+2ca
5.（ax+b）（cx+d)=acx²+(ad+bc)x+bd
已经知道（2x-a)²=b+4x²-12x，则a=（ ）b=（ ）？
4ax-a²=12x-b
4a=12
a²=b
a=3,b=9
如果x²+ax-6可分解为(x+b）（x+2），则a+b= （ ）
x²+ax-6=x²+(b+2)x+2b
a=b+2
-6=2b
a=-1,b=-3
a+b=-4
1.x²+y²
=(x+y)²-2xy
=3²-2X1
=7
2.（a+b）（a²-ab+b²）=a³+b³
3.（x-y）（x²+xy+y²）=x³-y³
4.（a+b+c）²=a²+b²+c²+2ab+2bc+2ca
5.（ax+b）（cx+d)=acx²+(ad+bc)x+bd
将（2x-a)²=b+4x²-12x打开得4x²-4xa+a²=4x²-12x+b
则-4xa=-12x得a=3
a²=b得b=9
由x²+ax-6=x²+(b+2)x+2b
得a=b+2
-6=2b
得a=-1,b=-3
则a+b=-4
楼上第一题错了。是1/3
二楼的才错，是7 啊
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