Question

计算下面各题，能简便计算的用简便方法计算 2-6/13÷9/26 (1/3+1/4)×36 6/7×(4/5-2/3)÷1/5

3/4-3/4×4/7+9/7

Answer 1

2-6/13÷9/26
= 2- (6/13)×(26/9)
=2- 4/3
=2/3
.
(1/3+1/4)×36
=(1/3)×36 +(1/4)×36
=12+9
=21
.
6/7×(4/5-2/3)÷1/5
=(6/7)×(4/5 - 2/3)×5
=(6/7)×(4 - 10/3)
=(6/7)×(2/3)
=4/7
.
3/4-3/4×4/7+9/7
=(3/4)×(1- 4/7）＋9/7
=(3/4)×(3/7）＋9/7
=(1/4)×(9/7)+ 9/7
=(1/4 +1)×(9/7)
=(5/4)×(9/7)
=45/28
=1又17/28

Answer 2

2-6/13÷9/26
= 2- (6/13)×(26/9)
=2- 4/3
=2/3
(1/3+1/4)×36
=(1/3)×36 +(1/4)×36
=12+9
=21
6/7×(4/5-2/3)÷1/5
=(6/7)×(4/5 - 2/3)×5
=(6/7)×(2/3)
=4/7.
3/4-3/4×4/7+9/7
=(3/4)×(1- 4/7）＋9/7
=(3/4)×(3/7）＋9/7
=(1/4)×(9/7)+ 9/7
=(1/4 +1)×(9/7)
=(5/4)×(9/7)
=45/28
=1又17/28