Câu 1: Tính a, 7/6 - 9/8 b, 8 x 9/10 c, 2/7 + 4/5 d, 4 : 8/5 Câu 2 a, Tính: 3/4 + 1/4 x 2/5 - 1/2 b, Tìm x: X x 4/7 = 5/6 + 2/9 7/8 : X = 1/2

Câu `1`

`a)`

`7/6-9/8`

`=56/48-54/48`

`=1/24`

`b)`

`8×9/10`

`=8/1×9/10`

`=36/5`

`c)`

`2/7+4/5`

`=10/35+28/35`

`=38/35`

`d)`

`4:8/5`

`=4×5/8`

`=4/1×5/8`

`=5/2`

Câu `2`

`a)` Tính :

`3/4+1/4×2/5-1/2`

`=3/4+1/10-1/2`

`=30/40+4/40-1/2`

`=17/20-1/2`

`=17/20-10/20`

`=7/20`

`b)` Tìm `x`

`x×4/7=5/6+2/9`

`x×4/7=19/18`

`x=19/18:4/7`

`x=19/18×7/4`

`x=133/72`

`------`

`7/8:x=1/2`

`x=7/8:1/2`

`x=7/8×2/1`

`x=7/4`

`Li`nh