3/4 × 8/9 - 1/3简便运算和7 × 5/49 + 3/14
问题描述：
3/4 × 8/9 - 1/3简便运算和7 × 5/49 + 3/14
快.
答
3/4 × 8/9 - 1/3
=2/3-1/3
=1/3
7 × 5/49 + 3/14
=5/7+3/14
=10/14+3/14
=13/14这是简便吗？恩，只能这样