(3x-y)(x+2y)最后等于多少!
问题描述:
(3x-y)(x+2y)最后等于多少!
答
=3x²+6xy-xy-2y²
=3x²+5xy-2y²
(3x-y)(x+2y)最后等于多少!
=3x²+6xy-xy-2y²
=3x²+5xy-2y²