3×[（3x-2y）+（x-3y+1）]-2×[2×（3x-2y）-（x-3y+1）]等于几
问题描述：
3×[（3x-2y）+（x-3y+1）]-2×[2×（3x-2y）-（x-3y+1）]等于几
答
原式=3(3x-2y+x-3y+1)+2(6x-4y-x+3y-1)
=3(4x-5y+1)+2(5x-y-1)
=12x-15y+3+10x-2y-2
=22x-17y+1