40道含有字母化简并代入求值的题，希望帮我一下我 大学理工类都有什么专业
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\u4e13\u4e1a\u8001\u5e08\u5728\u7ebf\u6743\u5a01\u7b54\u7591 zy.offercoming.com
原式=3X+2Y+4X+3Y=7X+5Y
当X=5,Y=3时
原式=5*7+（-3）*5+20
2.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
=5a^2-3b^2+a^2+b^2-5a^2-3b^2
=a^2-5b^2
=(-1)^2-5*1^2
=1-5
=-4
3.2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2其中a=-2,b=2
=2a^2b+2ab^2-2a^2b+2-2ab^2-2
=0
1、已知A,B是方程x^2+2x-5=0的两个实数根,
求(A^2+2AB+2A)(B^2+2AB+2B)的值.
由A,B是方程x^2+2x-5=0的两个实数根得：
AB=-5，A+B=-2
A^2+2AB+2A)(B^2+2AB+2B)
=AB（A+2B+2）（B+2A+2）
=-5（-2+B+2）（-2+A+2）
=-5AB
=25
2、1/2(x+y+z)方+1/2(x-y-z)(x-y+z)-z(x+y),其中x-y=6,xy=21.要详细步骤
化简得：
1/2(x+y+z)方+1/2(x-y-z)(x-y+z)-z(x+y)=
1/2[(x+y)方+2z(x+y)+z方]+1/2[(x-y)方-z方]-z(x+y)=
1/2(x+y)方+1/2(x-y)方=x方＋y方
由x-y=6,xy=21得，x方＋y方＝（x-y）方＋2xy＝78
3、a^2-ab+2b^2=3 求2ab-2a^2-4b^2-7的值
2ab-2a^2-4b^2-7
=2(ab-a^2-2b^2)-7
=-2(a^2-ab+2b^2)-7
=(-2)*3-7
=-6-7=-13
4、若A=2x^2+3xy-2x-3,B=-x^2+xy+2,且3A+6B的值与x无关，求y的值
3A+6B=6x^2+9xy-6x-9-6x^2+6xy+12
=15xy-6x+3
=x(15y-6)+3
5、9x+6x^2 -3(x-2/3x^2).其中x=-2
9x+6x?? -3(x-2/3x??)
=9x+6x??-3x+2x??
=8x??+6x
=8×(-2)??+6×(-2)
=32-12
=20
6、1/4(-4x^2+2x-8)-(1/2x-1),其中x=1/2
1/4(-4x??+2x-8)-(1/2x-1)
=-x??+1/2x-2-1/2x+1
=-x??-1
=-(1/2)??-1
=-1/4-1
=-5/4
7、3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz,其中x=-2,y=-3,z=1,
:3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz
=3x'y-2x'y+2xyz-x'z+4x'z-xyz
=x'y-xyz+3x'z
=4*(-3)-2*3*1+3*4*1
=-12-6+12
=-6
8、(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
=5a^2-3b^2+a^2+b^2-5a^2-3b^2
=a^2-5b^2
=(-1)^2-5*1^2
=1-5
=-4
9、2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2其中a=-2,b=2
=2a^2b+2ab^2-2a^2b+2-2ab^2-2
=0
10、(X-2分之1Y-1)(X-2分之1Y+1)-(X-2分之1Y-1)的平方
其中X=1.7,Y=3.9(先化简再求值)
[(X-2分之1Y)-1][(X+2分之1Y)+1]-(X-2分之1Y-1)平方
=(X+2分之1Y)平方-1-(X-2分之1Y)平方+2(X-2分之1Y)-1
=(X+2分之1Y)平方-(X-2分之1Y)平方+2(X-2分之1Y)-2
=2XY+2X-Y-2
=3.9*2.4+1.4
=10.76
绛旓細10銆(X-2鍒嗕箣1Y-1)(X-2鍒嗕箣1Y+1)-(X-2鍒嗕箣1Y-1)鐨勫钩鏂 鍏朵腑X=1.7,Y=3.9(鍏鍖栫畝鍐姹傚)[(X-2鍒嗕箣1Y)-1][(X+2鍒嗕箣1Y)+1]-(X-2鍒嗕箣1Y-1)骞虫柟 =(X+2鍒嗕箣1Y)骞虫柟-1-(X-2鍒嗕箣1Y)骞虫柟+2(X-2鍒嗕箣1Y)-1 =(X+2鍒嗕箣1Y)骞虫柟-(X-2鍒嗕箣1Y)骞虫柟+2(X-2...
绛旓細渚9銆 宸茬煡a=2b,c=3a,姹俛2+32b2锛峜2+3鐨勫.鍒嗘瀽锛氬皢b浣滀负宸茬煡,鐢╞琛ㄧずc鍚,杩愮敤鍖栧綊鐨勬濇兂,褰掔粨涓哄悓涓涓瀛楁瘝,鍐浠ｅ叆姹傚.鍥犱负a=2b,c=3a,鎵浠=6b 浠ｅ叆寰楋細鍘熷紡= 锛2b锛2+32b2锛嶏紙6b锛2+3=4b2+32b2锛36b2+3=3 鍏鍖栫畝,鍐嶅a鍙栦竴涓悎閫傜殑鏁颁唬鍏ユ眰鍊硷細a-3鍒嗕箣a+1-a+2鍒嗕箣a...
绛旓細1銆佷緥棰橈細2(2a²+2ab)-(3a²+4ab-b²)锛屽叾涓璦=2锛宐=-1 瑙ｏ細鍘熷紡=2a²+4ab-3a²-4ab+b²=b²-a²=1-4 =-3 2銆佷緥棰橈細1/4(a+b)²-6(a-b)+3/4(a+b)²+6(a-b)锛屽叾涓璦=2锛宐=-1 瑙ｏ細鍘熷紡=(a+b)²3...
绛旓細鍓嶉潰甯︽湁鈥-鈥濆彿鐨勬嫭鍙峰唴,鍐嶆眰2x-2[3x-(5x2-2x+1)]-4x2鐨勫,鍏朵腑x=-1锛 123锛庡悎骞跺悓绫婚」锛 7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y锛 124锛庡悎骞跺悓绫婚」锛5m2n+5mn2-mn+3m2n-6mn2-8mn锛 126锛庡幓鎷彿,鍚堝苟鍚岀被椤癸細 (1)(m+1)-(-n+m)锛 (2)4m-[5m-(2m-1)]锛 127锛鍖栫畝锛...
绛旓細鍒嗘瀽锛氬綋澶氶」寮忎笉闇瑕鍖栫畝鏃讹紝鐩存帴浠ｅ叆璁＄畻鍗冲彲銆備絾鏄紝涓瀹氳缁嗗績锛屼笉鑳藉嚭鐜拌绠椾笂鐨勯敊璇傛湰棰樼洿鎺ュ皢x=5浠ｅ叆璁＄畻鍙緱锛5-3=2.绫诲瀷浜岋細鍖栫畝鍚浠ｅ叆姹傚 渚嬮2锛氭眰浠ｆ暟寮忕殑鍊硷細2a+锛-2a+5锛-锛-3a+2锛夛紝鍏朵腑a=1.鍒嗘瀽锛氭牴鎹悓绫婚」鐨勬蹇碉紝鍚湁鐩稿悓鐨勫瓧姣嶏紝骞朵笖鐩稿悓瀛楁瘝鐨鎸囨暟鐩稿悓锛屾槸鍚岀被椤圭殑涓ら」...
绛旓細40銆鍖栫畝骞舵眰鍊銆俒锛5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x锛屽叾涓瓁=2锛寉=3 41銆佸凡鐭=x3-2x2+x-4锛孊=2x3-5x+3锛屾眰A+B鐨勫 42锛庡凡鐭=x3-2x2+x-4锛孊=2x3-5x+3锛屾眰A-B鐨勫笺 43锛庤嫢a=-0.2锛宐=0.5锛屼唬鏁板紡 (|a2b|-|ab2|)鐨勫笺 44銆佸綋a=-1锛宐=1锛宑=...
绛旓細(鍏鍖栫畝鍐姹傚) [(X-2鍒嗕箣1Y)-1][(X+2鍒嗕箣1Y)+1]-(X-2鍒嗕箣1Y-1)骞虫柟 =(X+2鍒嗕箣1Y)骞虫柟-1-(X-2鍒嗕箣1Y)骞虫柟+2(X-2鍒嗕箣1Y)-1 =(X+2鍒嗕箣1Y)骞虫柟-(X-2鍒嗕箣1Y)骞虫柟+2(X-2鍒嗕箣1Y)-2 =2XY+2X-Y-2 =3.9*2.4+1.4 =10.76 鍖栭棿姹傚: 涓嬮潰鐨勪綘鑷繁姹傚惂``` 1銆-9(x-...
绛旓細鍒濅竴鏁板鍖栫畝姹傚浠嬬粛濡備笅锛氬厛鍖栫畝锛屽啀浠ｅ叆姹傚锛屽垎鏋愶細鍏堝幓鎷彿锛岀劧鍚庡悎骞跺悓绫婚」锛屽啀浠ｅ叆鏁版嵁姹傚硷紱鍦ㄥ椤瑰紡涓紝鎵鍚瓧姣鐩稿悓锛屽苟涓旂浉鍚屽瓧姣嶇殑娆℃暟涔熺浉鍚岀殑椤逛负鍚岀被椤广傚悎骞跺悓绫婚」灏辨槸鍒╃敤涔樻硶鍒嗛厤寰嬶紝鍚岀被椤圭殑绯绘暟鐩稿姞鎵寰楃殑缁撴灉浣滀负鏂扮殑绯绘暟锛屽瓧姣嶄笌瀛楁瘝鐨勬寚鏁颁繚鎸佷笉鍙樸傚厛鍙樺舰锛屽啀鏁翠綋浠ｅ叆锛屽垎鏋愶細鍏堝幓鎷彿...
绛旓細=3x2-2{-15x2-20x+1} 锛鍖栫畝澶ф嫭鍙烽噷鐨勫紡瀛愶級=3x2+30x2+40x-2 锛堝幓鎺夊ぇ鎷彿锛=33x2+40x-2 褰搙=-2鏃,鍘熷紡=33脳(-2)2+40脳(-2)-2=132-80-2=50 渚5锛庤嫢16x3m-1y5鍜-x5y2n+1鏄悓绫婚」,姹3m+2n鐨勫.鈭16x3m-1y5鍜-x5y2n+1鏄悓绫婚」 鈭村搴攛,y鐨勬鏁板簲鍒嗗埆鐩哥瓑 ...
绛旓細鍏鍖栫畝锛屽啀浠ｅ叆姹傚锛屽垎鏋愶細鍏堝幓鎷彿锛岀劧鍚庡悎骞跺悓绫婚」锛屽啀浠ｅ叆鏁版嵁姹傚硷紱鍦ㄥ椤瑰紡涓紝鎵鍚瓧姣鐩稿悓锛屽苟涓旂浉鍚屽瓧姣嶇殑娆℃暟涔熺浉鍚岀殑椤逛负鍚岀被椤广傚悎骞跺悓绫婚」灏辨槸鍒╃敤涔樻硶鍒嗛厤寰嬶紝鍚岀被椤圭殑绯绘暟鐩稿姞鎵寰楃殑缁撴灉浣滀负鏂扮殑绯绘暟锛屽瓧姣嶄笌瀛楁瘝鐨勬寚鏁颁繚鎸佷笉鍙樸傚厛鍙樺舰锛屽啀鏁翠綋浠ｅ叆锛屽垎鏋愶細鍏堝幓鎷彿锛屽悎骞跺悓绫婚」锛岀劧鍚庡啀灏...
