Question

用简便的方法计算下面各题

15－5÷12－7/12

2－1/4－1/3－3/4

5/8－（5/8－1/2）

1/5×37%＋4/5×37%

1/6÷11/24－3/8×4//11

68－7.5＋32－2.5

Answer 1

15－5÷12－7/12
=15－5/12－7/12
=15－(5/12+7/12)
=15-1
=14

2－1/4－1/3－3/4
=2－1/4－3/4－1/3
=2-(1/4+3/4)－1/3
=2-1-1/3
=1-1/3
=2/3

5/8－（5/8－1/2）
=5/8-5/8+1/2
=1/2

1/5×37%＋4/5×37%
=(1/5＋4/5)×37%
=37%

1/6÷11/24－3/8×4/11
=1/6*24/11－3/8×4/11
=4/11－3/8×4/11
=4/11(1－3/8)
=4/11*5/8
=5/22

68－7.5＋32－2.5
=68＋32－7.5－2.5
=100－(7.5+2.5)
=100-10
=90

Answer 2

15-（5+7）/12=14
2-（1/4+3/4）-1/3=2/3
5/8-5/8+1/2=1/2
（1/5+4/5）*37%=37%=0.37
1/6*24/11-3/8*4/11=（1/3/8）*4/11=5/22
（68+32）-（7.5+2.5）=90

Answer 3

15－5÷12－7/12=15-(5+7)/12=14
2－1/4－1/3－3/4=2-(1+3)/4-1/3=5/3
5/8－（5/8－1/2）=(5-5)/8+1/2=1/2
1/5×37%＋4/5×37%=(1+4)/5*37%=37%
68－7.5＋32－2.5=68+32-7.5-2.5=90
1/6÷11/24－3/8×4/11=（1/4-3/8）*4/11=-1/22

Answer 4

（1）15-（5/12－7/12）=15-1=14
(2) 2-(1/4+3/4)-1/3=2/3
(3) 5/8-5/8+1/2=1/2
(4) (1/5+4/5)×37%=0.37
(5) 4/11-3/8×4/11=4/11×(1-3/8)=5/22
(6) (68+32)-(7.5+2.5)=99