x-1/2+1≥x/4 0.01x-1≤0.02x 今天的作业 求速度 快的还可以再加20

1)x(2)x>= -3/2
(3)x>= -2
(4)x>= -100。。

1,,,（x-1）/2+1≥x/4 x≥-100
2x-x≥-100
2.,,,,0.01x-1≤0.02x x-100≤2x
2（x-1）+4≥x
2x+2≥x
2x-x≥-2
x≥-2


应该是队的

（x-1）/2+1≥x/4 两边都乘以4
2（x-1）+4≥x
2x-2+4≥x
2x+2≥x
2x-x≥-2
x≥-2
0.01x-1≤0.02x 都乘以100
x-100≤2x
2x-x≥-100
x≥-100

①x-1/2+1≥x/4
x-x/4≥1/2-1
3/4x≥-1/2
x≥-2/3
②0.01x-1≤0.02x
0.02x-0.01x≥-1
0.01x≥-1
x≥-100