把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3
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把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3y)²
把下列各式分解因式
x(x+y)(x-y)-x(y+x)²
7、已知2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
把下列各式分解因式
x(x+y)(x-y)-x(y+x)²
7、已知2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
x(x+y)(x-y)-x(y+x)^2
=x(x+y)(x-y)-x(x+y)^2
=x(x+y){(x-y)-(x+y)}
=2xy(x+y)
7y(x-3y)^2-2(3y-x)^3
=7y(x-3y)^2 +2(x-3y)^3
={7y+2(x-3y)}(x-3y)^2
=(2x+y)(x-3y)^2
=6x1^2
=6
=x(x+y)(x-y)-x(x+y)^2
=x(x+y){(x-y)-(x+y)}
=2xy(x+y)
7y(x-3y)^2-2(3y-x)^3
=7y(x-3y)^2 +2(x-3y)^3
={7y+2(x-3y)}(x-3y)^2
=(2x+y)(x-3y)^2
=6x1^2
=6
把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3
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