3X-(5x-2y)+3y
问题描述:
3X-(5x-2y)+3y
答
3X-(5x-2y)+3y
=3X-5x+2y+3y
=5y-2X
答
3X-(5x-2y)+3y
=3x-5x+2y+3y
=-2x+5y
答
原式=3x-5x+2y+3y
=-2x+5y