Question

脱式计算：5/6*3/8+5/6*5/8 4/7*（14+7/9) 2除于（3/5*2/3） 15除（5/12+5/6）

急。。把算式写详细点

Answer 1

1、7/8×16/21-1/9
=2/3-1/9
=4/9-1/9
=1/3
2、59×2/15+2/15
=（59+1）×2/15
=60×2/15
=8
3、3/4÷3/4×1/6
=3/4×4/3×1/6
=1/6
4、(19/40+38)÷19
=19/40÷19+38÷19
=1/40+2
=81/40
5、8/9÷2/3×3/4
=8/9×3/2×3/4
=1
6、1/7×5/12+5/12÷7/5
=（1/7+5/7）×5/12
=6/7×5/12
=5/14