1.脱式计算1）2/13×5/8÷15/262）8/9÷2/3÷1/43）2/7×14/15×5/64）8/9÷5/6×

1）2/13×5/8÷15/26
=2/13x5/8x26/15
=1/6
2）8/9÷2/3÷1/4
=8/9x3/2x4
=16/3
3）2/7×14/15×5/6
=4/15x5/6
=2/9
4）8/9÷5/6×5/16
=8/9x6/5x5/16
=1/3
5）5/3÷10÷5/6
=5/3x1/10x6/5
=1/5
6）2/13×39×5/21
=6x5/21
=15/7
2。下面各题怎样简便就怎样算,每题都要写出主要的计算过程。
1）12×1/3+12÷2/3
=12x1/3+12x3/2
=(1/3+3/2)x12
=11/6x12
=22
2）1/7+5/7÷5/6+5/12
=1/7+5/7x6/5+5/12
=1/7+6/7+5/12
=1+5/12
=17/12
3）（3/4-1/15×9）÷3/5
=（3/4-1/15×9）x5/3
=(3/4-3/5)x5/3
=3/4x5/3-3/5x5/3
=-1/4
4）97×5/96
=(96+1)x5/96
=96x5/96+5/96
=5又5/96
5）（3/5+3/10）÷（1-1/10）
=（3/5+3/10）x10/9
=9/10x10/9
=1
6）5/8×4/7÷5/7
=5/8x4/7x7/5
=1/2