(2X-3Y-1)乘以(2X+3Y+1)等于多少

问题描述:

(2X-3Y-1)乘以(2X+3Y+1)等于多少

(2X-3Y-1)乘以(2X+3Y+1)
=(2x)²-(3y+1)²
=4x²-9y²-6y-1