5x5-15x3y-20xy2

问题描述:

5x5-15x3y-20xy2
翻译:5x的5次方减15x的三次方y减20xy的平方
3a2b2-17abxy+10x2y2
那些2就是平方大家应该能看懂吧!

5x5-15x3y-20xy2
=5x(x^4-3x²y-4y²)
=5x(x²-4y)(x²+y)
3a2b2-17abxy+10x2y2
=(3ab-2xy)(ab-5xy)