Question

(5/8-1/4)÷(8/9+1/3)？

(5/8-1/4)÷(8/9+1/3)
3/8+3/4×2/3÷6
（1/4+1/5）×4×5
3/5+（1-7/10）÷3/20
4.5X+0.2X=6.1（方程）
3/4X-1/3=5/6（方程）

Answer 1

①( 5/8 - 1/4 ) ÷ ( 8/9 + 1/3 )
= ( 5/8 - 2/8 ) ÷ ( 8/9 + 3/9 )
= 3/8 ÷ 11/9
= 3/8 × 9/11
= 27/88

② 3/8 + 3/4 × 2/3 ÷ 6
= 3/8 + 12/12 ÷ 6
= 3/8 + 6/12
= 3/8 + 1/2
= 3/8 + 4/8
= 7/8

③ （1/4 + 1/5）×4×5
= （1/4 + 1/5）× 20
= 1/4 × 20 + 1/5 × 20
= 5 + 4
= 9

④ 3/5 +（1 - 7/10）÷ 3/20
= 3/5 + 3/10 × 20/3
= 3/5 + 60/30
= 3/5 + 2
= 3/5 + 10/5
= 13/5

⑤ 4.5X + 0.2X = 6.1
4.7 x = 6.1
x = 6.1 / 4.7
x = 61/47

⑥ 3/4X - 1/3 = 5/6
(3/4) x = 5/6 + 2/6
(3/4) x = 7/6
x = 7/6 ÷ 3/4
x = 7/6 × 4/3
x = 28/18
x = 14/9

追问

② 3/8 + 3/4 × 2/3 ÷ 6

我算的11/24

追答

② 3/8 + 3/4 × 2/3 ÷ 6
= 3/8 + 6/12 ÷ 6
= 3/8 + 1/12
= 9/24 + 2/24
= 11/24
算错了。。。。。。不好意思啊。。。。。

Answer 2

27/88

Answer 3

27/88

追问

3/8+3/4×2/3÷6
（1/4+1/5）×4×5
3/5+（1-7/10）÷3/20
4.5X+0.2X=6.1（方程）
3/4X-1/3=5/6（方程）

追答

11/24
9
13/5
61/47
14/9

追问

4.5X+0.2X=6.1（方程）

我算的3呢