Question

./././

.?

Answer 1

\(a,5x-15\le0\\ \Leftrightarrow5x\le15\\ \Leftrightarrow x\le3\)

Answer 2

\(b,\dfrac{-2x+7}{3}< 5\\ \Leftrightarrow-2x+7< 15\\ \Leftrightarrow-2x< 15-7\\ \Leftrightarrow-2x< 8\\ \Leftrightarrow x>\dfrac{8}{-2}\\ \Leftrightarrow x>-4\)

Answer 3

a: =>x-3<=0

=>x<=3

b: =>-2x+7<15

=>-2x<8

=>x>-4

Answer 4

Đề là gì nhỉ?