计算:(-7x²y)(2x²y-3xy³+xy)(-7x²y)(2x²y-3xy³+xy)
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计算:(-7x²y)(2x²y-3xy³+xy)(-7x²y)(2x²y-3xy³+xy)
计算:(-7x²y)(2x²y-3xy³+xy)
(-7x²y)(2x²y-3xy³+xy)
计算:(-7x²y)(2x²y-3xy³+xy)(-7x²y)(2x²y-3xy³+xy)
(-7x²y)(2x²y-3xy³+xy)
= (-7x²y)×2x²y-(-7x²y)×3xy³+(-7x²y)×xy
=-14x的4次方y²+21x³y的4次方-7x³y²
2、=(-5x)²-(3/2)²
=25x²-9/4