因式分解填空:4ax²-ay²=?,mx²-my²=?,x²-9y²=?
问题描述:
因式分解填空:4ax²-ay²=?,mx²-my²=?,x²-9y²=?
答
4ax²-ay²
=a(4x²-y²)
=a(2x+y)(2x-y)
mx²-my²
=m(x²-y²)
=m(x+y)(x-y)
x²-9y²
=x²-(3y)²
=(x+3y)(x-3y)