Question

[truong thi my]

Tìm số nguyên x biết : (-8)/15 < x/40 < (-7)/15

Answer 1

[l҉o҉n҉g҉ d҉z҉]

(-64)/120 < 3x/120 < (-56)/120

=> 3x=-63

=> 3x=-60

=> 3x=-57

=> x=-21

=> x=-20

=> x=-19 

Answer 2

[Nguyễn Hoàng Tiến]

<=>-64/120<3x/120<-56/120

<=>-64<3x<-56

<=>-x=-63;-62;-61;-60;-59;-58;-57

Maf x nguyeen =>x=-21;-20;-19