{3(2x-y)+4(x-2y)=87 {2(3x-y)-3(x-y)=82 这个方程组怎么做,写在纸上
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把6x(x-y)的平方+3(y-x)的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]
1.(-2a)³·b²÷(8a³b²) 2.-5x(2x²-3x+4)+4x³+15x3.(x²-2y²)(x+2y)-2xy(x-y)4.(x-y+z)(x-y-z)化简求值 [(x+y)(x-y)-(x+y)²-2y(x-2y)]÷(-2y),其中x=5,y=2003
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y),其中x=4,y=1.5
(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y),其中x=4,y=1.5
化简((X-2Y)的平方+(X-Y)(x+Y)-2(X-3Y)(X-Y))除以Y
(2x-y)+(x+3y)(x-3y)=
已知x-y=-3,-x+3y=2,求代数式x^2-4xy+3y^2的值.这题中.x^2-4xy+3y^2=(x-3y)(x-y) 是如何算的.已知x-y=-3,-x+3y=2,求代数式x^2-4xy+3y^2的值.这题中.x^2-4xy+3y^2=(x-3y)(x-y) 是如何算的.=(x-y)(x+y)-4y(x-y
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
4x-2y+3y=-( )=4x-( ).
已知x+y=-2,试计算1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y的值
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值
y'=(y/x)^2+y/x+4微分方程
(y-x)^4(x-y)^3+2(x-y)^6(y-x)
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5