六年级数学：分数混合简便运算。。很急！！今晚就要用的！！麻烦快一点好吗？？

Question

1/7×6/13+8/13×1/7=？ 2-5/11÷9/22-5/9=？ （5/6-3/4）÷5/12+9/5=？
把过程也写出来啊~~在线等待、、谢了！！

Answer 1

1/7×6/13+8/13×1/7=(6/13 + 8/13) X 1/7 = 14/13 x 1/7 = 2/13

2-5/11÷9/22-5/9= 2 - 5/11 * 22/9 - 5/9 = 2- (5*22)/(9*11) - 5/9
= 2 - 5/9( 22/11 + 1) = 2 - 5/9 * 3 = 2- 5/3 = 1/3

（5/6-3/4）÷5/12+9/5=？
=(5/6 - 3/4)* 12/5 + 9/5
=((5/6 - 3/4)*12 + 9)/5
=(5/6 * 12 - 3/4 * 12 + 9) /5
=(10-9+9)/5 = 2

Answer 2

1/7*(6/13+8/13)=2/13
1/3
2

Answer 3

1/7*(6/13+8/13)
5/6*12/5-3/4*5/12+9/5
2-5/11*22/9-5/9
再算