Question

计算下面各题，能简便计算的要用简便方法计算。 2/3÷1/2+1/2÷2/3 2/3+1/3×2/17

2÷［4×（1/2-1/3］ （3/7+5/8-1/4）×56 13/14×2/7+13/14×5/7-13/14 8/9-8/9×5/12÷10/3 18/7-1/2÷3/4-1/3 11÷5/8÷5/8

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

2/3÷1/2+1/2÷2/3
2/3+1/3×2/17
=2/3*2+1/2*3/2
=2/3*(1+1/17)
=4/3+3/4
=2/3*2/17
=16/12+9/12
=4/51
=25/12
2÷［4×（1/2-1/3］
（3/7+5/8-1/4）×56
=2÷(4×1/6)
=24+35-14
=2×3/2
=10+35
=3
=45
13/14×2/7+13/14×5/7-13/14
8/9-8/9×5/12÷10/3
=13/14*(2/7+5/7-1)
=8/9-8/9×5/12×3/10
=13/14*0
=8/9(1-7/8)
=0
=8/9*1/8
=1/9
18/7-1/2÷3/4-1/3
11÷5/8÷5/8
=18/7-1/2*4/3-1/3
=11×8/5×8/5
=18/7-2/3-1/3
=88/5*8/5
=18/7-1
=704/25
=11/7