Question

怎样简便就怎样算？5/7+5/9×3/2+1/6。 4/9×5/7+2/7÷9/4。4/9×5/1

怎样简便就怎样算？5/7+5/9×3/2+1/6。
4/9×5/7+2/7÷9/4。4/9×5/11+5/9×7/11。1/9×9/10-1/9×3/10+4/9×1/10。

Answer 1

5/7+5/9×3/2+1/6
= 5/7+5/6+1/6
= 7/5+1
= 1+2/5+1
= 2又2/5

4/9×5/7+2/7÷9/4
= 4/9×5/7+2/7×4/9
= 4/9×(5/7+2/7)
= 4/9 × 1
= 4/9

4/9×5/11+5/9×7/11
= 4/9×5/11+ 7/9×5/11
= 5/11×(4/9+7/9)
= 5/11 × 11/9
= 5/9

1/9×9/10-1/9×3/10+4/9×1/10
= 1/9×9/10-1/9×3/10+1/9×4/10
= 1/9×(9/10-3/10+4/10)
= 1/9×10/10
= 1/9