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(x-y)³
=(x-y)(x-y)²
=(x-y)(x²-2xy+y²)
=x³-3x²y+3xy²-y³
如果不懂,请追问,祝学习愉快!
=(x-y)(x-y)²
=(x-y)(x²-2xy+y²)
=x³-3x²y+3xy²-y³
如果不懂,请追问,祝学习愉快!
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(x-y)3次方-(y-x)
=(x-y)3次方+(x-y)
=(x-y){(x-y)2次方-1}
=(x-y)(x-y+1)(x-y-1)
=(x-y)3次方+(x-y)
=(x-y){(x-y)2次方-1}
=(x-y)(x-y+1)(x-y-1)
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