Question

当a为何值时,方程1/2{x-a}=2-x的解.

Answer 1

1/2(x-a)=2-x

1/2x-1/2a=2-x

1.5x=2+0.5a

x=4/3+a/3

{1}为非正数 4/3+a/3≤0,a≤-4

{2}不大于5 4/3+a/3≤5,a≤11