聪明的人帮我 1.(x+y)(x-y)-(x-y)² 2.(3a-2b)²-(3a+2b)²
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聪明的人帮我 1.(x+y)(x-y)-(x-y)² 2.(3a-2b)²-(3a+2b)² 3.2(x+1)²-½(x+2)(x-3)
写的清楚点 分不多 4.(2x-y)²-4(x-y)(x+2y) 5.(x-2y+4)(x+2y-4)
写的清楚点 分不多 4.(2x-y)²-4(x-y)(x+2y) 5.(x-2y+4)(x+2y-4)
1,x^2-y^2-x^2-y^2+2xy=2xy
2,9a^2+4b^2-12ab-9a^2-4b^2-12ab=-24ab
3,2x^2+2+4x-1/2(x^2-x-6)=2x^2/3+9x/2+5
4,4x^2-4xy+y^2-4x^2+8y^2-4xy=9y^2-8xy
5,x^2-4y^2-16+16y
2,9a^2+4b^2-12ab-9a^2-4b^2-12ab=-24ab
3,2x^2+2+4x-1/2(x^2-x-6)=2x^2/3+9x/2+5
4,4x^2-4xy+y^2-4x^2+8y^2-4xy=9y^2-8xy
5,x^2-4y^2-16+16y
聪明的人帮我 1.(x+y)(x-y)-(x-y)² 2.(3a-2b)²-(3a+2b)²
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值
计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
已知|x-y-3|+(a+b+4)²=0,求2a+2b-(a+b)分之(x-y)²-3(y-x)的值
若集合A={(x,y)|y=x²,x∊R},B={(x,y)|y=2x²+2x-3,x&
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
1.设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,
1.设A=2x²-3xy+y²+x-3y,B=4x²-6xy+2y²+4x-y,
已知集合A={y|y=x²-2x},B{x|y=根号(-x²-2x+3)},则A∩B=
分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+