3 × 2/9 + 1/3 5/7 × 3/25 + 3/7 3/14 ×2/3 + 1/6

问题描述:

3 × 2/9 + 1/3 5/7 × 3/25 + 3/7 3/14 ×2/3 + 1/6
3 × 2/9 + 1/3
5/7 × 3/25 + 3/7
3/14 × 2/3 + 1/6

3 × 2/9 + 1/3
=2/3+1/3
=1
5/7 × 3/25 + 3/7
=3/35+15/35
=18/35
3/14 × 2/3 + 1/6
=1/7+1/6
=6/42+7/42
=13/42