当x=多少时,代数式5x-1/2 +1的值为非负数

问题描述:

当x=多少时,代数式5x-1/2 +1的值为非负数

因5x-1/2 +1的值为非负数
所以 5x-1/2 +1≥0
5x≥-1/2
x≥-1/10
当x≥-1/10时,代数式5x-1/2 +1的值为非负数.

依题意得:
5x-1/2 +1大于等于0
10x-1+2大于等于0
10x大于等于-1
x大于等于-1/10

5x-1/2 +1>=0
x>=-1/10

5x-1/2 +1>=0
5x-1/2 >=-1
5x-1>=-2
5x>=-1
x>=-1/5