解不等式组 1-1/5x大于-2和 1-1/5x小于3/5

问题描述:

解不等式组 1-1/5x大于-2和 1-1/5x小于3/5

1/2>x>1/15

1-1/5x>-2
3-1/5x>0
(15x-1)/5x>0
(15x-1)x>0
x>1/15 or x1-1/5x2/5-1/5x(2x-1)/5x(2x-1)x0

m式的微笑a
解不等式组:
1-(1/5)x>-2 ①
1-(1/5)x