(2x的二次方-5y)(4x-7y)计算题
问题描述:
(2x的二次方-5y)(4x-7y)计算题
答
=2x²*4x-2x²*7y-5y*4x+5y*7y =8x³-14x²y-20xy+35y²
答
=8x³-14x²y-20xy+35y²
答
(2x的二次方-5y)(4x-7y)
=2x的二次方(4x-7y)-5y)(4x-7y)
=8x的3次方-14x的二次方y-20xy+35y的二次方