Tính: -7/25 . 39/-14 . 50/78

a, -7/25 . 39/-14 . 50/78
b, -3/11 . -22/66 . 121/15
bài 2
a. 1/7.| x | - 4/5 = 1/5
b, | 2x - 3/4 | -3/8 = 1/8
c, | 3/4x - 3/5 | - 1/2 = 0
mn giúp e vs