(y+1)(y^2-1)-(y+1)^3因式分解写在纸上。。。。。。
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(y+1)(y²-1)-(y+1)³
=(y+1)(y+1)(y-1)-(y+1)³
=(y+1)²[(y-1)-(y+1)]
=(y+1)²(-2)
=-2(y+1)²
=(y+1)(y+1)(y-1)-(y+1)³
=(y+1)²[(y-1)-(y+1)]
=(y+1)²(-2)
=-2(y+1)²
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原式
= (y+1)(y+1)(y-1) -(y+1)^3
= (y+1)^2(y-1) -(y+1)^3
= (y+1)^2(y-1-y-1)
= -2(y+1)^2
= (y+1)(y+1)(y-1) -(y+1)^3
= (y+1)^2(y-1) -(y+1)^3
= (y+1)^2(y-1-y-1)
= -2(y+1)^2
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(y+1){y^2-1-(y+1)^2}=(y-1){(y+y+1)(y-y-1)-1}=(y+1){(2y+1)*(-1)-1}=(y+1)(-2y-2)=-2(y+1)^2
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