Question

几个数学简便运算的问题，必须要过程

1、（8/15÷0.32-7/9×0.375）÷1 又3/8=
2、1又3/7×(3又1/13-1又9/11)×0.7×28又3/8=
3、0.5×236×59/119=
4、(1又1/1992×3.6+3又3/5×8又1991/1992)÷9又3/5÷3又3/4=
5、(20又94/95×1.65-20又94/95+20又95/94)×47.5×0.8×2.5=
6、(9又2/7+7又2/9)÷(5/7+5/9)=

Answer 1

1、（8/15÷0.32-7/9×0.375）÷1 又3/8
=(8/15x25/8-7/9x3/8)x8/11
=(5/3-7/24)x8/11
=11/8x8/11
=1

2、1又3/7×(3又1/13-1又9/11)×0.7×28又3/8
=10/7x(3+1/13-1-9/11)x7/10x(28+3/8)
=(2-106/143)x227/8
=180/143x227/8
=10215/286
(题目有问题）

3、0.5×236×59/119
=118x59/119
=(119-1)x59/119
=119x59/119-59/119
=59-59/119
=58又60/119

4、(1又1/1992×3.6+3又3/5×8又1991/1992)÷9又3/5÷3又3/4=
=3.6x(1又1/1992+8又1991/1992)x[48/5]/[15/4]
=3.6x10x48/5x4/15
=92.16

5、(20又94/95×1.65-20又94/95+20又95/94)×47.5×0.8×2.5=
=20又94/95x(1.65-1+1)x47.5x2
=20又94/95x33/20x95
=1994/95x33/20x95
=3290.1

6、(9又2/7+7又2/9)÷(5/7+5/9)
=(9+2/7+7+2/9)/[80/63]

=(16+32/63)x63/80
=16x63/80+32/63x63/80
=63/5+32/80
=13

Answer 2

1,(8/15÷8/25-7/9×3/8)÷11/8=(8/15×25/8-7/3×1/8)×8/11=(1/3×5-7/24)×8/11=(5/3-7/24)×8/11=(40-7)/24×8/11=33/24×8/11=11/8×8/11=1

4,[(1+1/1992)×3.6+3.6×(8+1991/1992)]×5/48×4/15=[(1+1/1992)×3.6+3.6×(9-1/1992)]×1/12×1/3=3.6×(1+9)÷12÷3=36÷12÷3=1

6,(65/7+65/9)÷(5/7+5/9)=13(5/7+5/9)÷(5/7+5/9)=13

另外几道题没算出来，不好意思，不过370116算得有错