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÷2/32/3+1/3×2/172÷［4×（1/2-1/3］（3/7+5/8-1/4）×5613/14×2/7+13/14×5/7-13/148/9-8/9×5/12÷10/318/7-1/2÷3/4-1/311÷5/8÷5/8

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

2/3÷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