计算(2x-3y)(x+4y)要过程RT
问题描述:
计算(2x-3y)(x+4y)要过程
RT
答
2X^2+5Xy-12y^2
答
(2x-3y)(x+4y)
=2x*x+2x*4y-3y*x-3y*4y
=2x^2+8xy-3xy-12y^2
=2x^2+5xy5-12y^2