-3(2x-y)-2(4x+1/2y)+2009

问题描述:

-3(2x-y)-2(4x+1/2y)+2009

原式=-6x+3y-8x+y+2009
=-14x+4y+2009

=-6X+3Y-8X-Y+2009
=-14X+2Y+2009
=2(Y-7X)+2009

=-6x+3y-8x-y+2009
=-14x+2y+2009