-3(2x-y)-2(4x+1/2y)+2009
问题描述:
-3(2x-y)-2(4x+1/2y)+2009
答
原式=-6x+3y-8x+y+2009
=-14x+4y+2009
答
=-6X+3Y-8X-Y+2009
=-14X+2Y+2009
=2(Y-7X)+2009
答
=-6x+3y-8x-y+2009
=-14x+2y+2009