(-9m^2+4n^2)÷(3m+2n)
问题描述:
(-9m^2+4n^2)÷(3m+2n)
答
(-9m^2+4n^2)÷(3m+2n)
=(4n^2-9m^2)÷(3m+2n)
=(2n+3m)(2n-3m)÷(3m+2n)
=2n-3m