Question

根据不等式性质,把下列不等式化为“x＞a”或x＜a的形式：1/2x≥1/2(5-x);-0.3x＜-1.5；0.2x＞-

Answer 1

1、1/2x≥1/2(5-x)

1/2x≥5/2-1/2x

x≥5/2

2、-0.3x＜-1.5

x>-1.5/(-0.3) (不等式两边同除以负数,不等式变号)

x>5

3、0.2x＞-0.4

x＞-0.4/0.2

x＞-2