问题
解答题
化简求值(4x-2y)-[-2(x-y)+(2x+y)]-4x,其中x=0,y=-3.
答案
原式=4x-2y-(-2x+2y+2x+y)-4x
=4x-2y+2x-2y-2x-y-4x
=-5y,
当x=0,y=-3时,原式=-5×(-3)=15.
化简求值(4x-2y)-[-2(x-y)+(2x+y)]-4x,其中x=0,y=-3.
原式=4x-2y-(-2x+2y+2x+y)-4x
=4x-2y+2x-2y-2x-y-4x
=-5y,
当x=0,y=-3时,原式=-5×(-3)=15.