2 và 3/5 – 1 và 1/3 x 9/8 + 7/15 60/75 x 25% : 3/5 – 2/15 ( 3/4 + 1/2 : 2/3 ) x 0,4 – 3/10

Đáp án:

`a,`

`2 3/5 – 1 1/3 × 9/8 + 7/15`

`= 13/5 – 4/3 × 9/8 + 7/15`

`= 13/5 – 3/2 + 7/15`

`= 11/10 + 7/15`

`= 47/30`

`b,`

`60/75 × 25% ÷ 3/5 – 2/15`

`= 1/5 ÷ 3/5 – 2/15`

`= 1/3 – 2/15`

`= 1/5`

`c,`

`(3/4 + 1/2 ÷ 2/3) × 0,4 – 3/10`

`= (3/4 + 3/4) × 0,4 – 3/10`

`= 3/2 × 0,4 – 3/10`

`= 3/5 – 3/10`

`= 3/10`