分数混合运算和简便计算

Question

如题所述

Answer 1

5/9X(9/5+18)
＝5/9×9/5＋5/9×18
=1+10
=11

5/9X5/6+4/9÷6/5
＝5/9×5/6＋4/9×5/6
＝（5/9+4/9）×5/6
＝1×5/6
＝5/6

13/14-15/28÷5/8
＝13/14－15/28×8/5
＝13/14－3/7×2
＝13/14－6／7
= 1/14

4÷4/5-4/5÷4
＝4×5/4－4/5×1/4
＝5＋1/5
＝5又1/5

(5/6-3/4)÷3/8
＝（5/6－3/4）×8/3
＝5/6×8/3－3/4×8/3
＝20／9－2
=2/9

7/11÷[2/5-(1-7/10)}
＝7/11÷[2/5－3/10]
＝7/11÷1/10
＝70/11