(3x-5y+1)^2-(x+2y)(x-2y)

问题描述:

(3x-5y+1)^2-(x+2y)(x-2y)

(3x-5y+1)^2-(x+2y)(x-2y)
=9x²+25y²+1-30xy+6x-10y-x²+4y²
=8x²+29y²-30xy+6x-10y+1完全错了!!!!!!!你题目错了吧做错了