Bài 1: Tính hợp lí a, -5/13 . 5/9.13/-5.(-18) b, 1/3.4/5+1/3.6/5+2/3 c, -4/7+3/8+-3/7+5/8+1/2 Bài 2: Tính a, 2/3+1/8.10/7 b, (4/5+1/3).(2/11.-9/11) c,

Bài 1: Tính hợp lí
a, -5/13 . 5/9.13/-5.(-18)
b, 1/3.4/5+1/3.6/5+2/3
c, -4/7+3/8+-3/7+5/8+1/2
Bài 2: Tính
a, 2/3+1/8.10/7
b, (4/5+1/3).(2/11.-9/11)
c, 7/12-27/7:18
d, (2-1/2):(-4/3-(-1/20
Bài 3: Tìm x, biết:
a, x.-5/7=1/14
b,x:7/17=17/8
c,3/4.x=-4/15
d,3/4.x+1/5=1/6
e, 1/3+1/2:x=-4
Bài 4: Tính
a, -6/11:(3/5.4/11)
b, 7/12+5/12:6-11/36
c, (2/3-1/4+5/11):(5/12+1-7/11).