Question

简便计算急急急急急急急急急急急急急急急急急急急急急急急急急急急

1375＋450÷18
2.84＋5.6－0.84＋4.4
2/3×5/8﹢1/3×5/8
（20.1－21×6/7﹚÷7
2－2/3÷4/5－1/6
5/6×[3/4－﹙7/16－1/4﹚

Answer 1

1375＋450÷18
=1375+25
=1400；
2.84＋5.6－0.84＋4.4
=（2.84-0.84）+（5.6+4.4）
=2+10
=12；
2/3×5/8﹢1/3×5/8
=（2/3+1/3）×(5/8)
=5/8;
（20.1－21×6/7﹚÷7
=(20.1-18)÷7
=2.1÷7
=0.3;
2－2/3÷4/5－1/6
=2-(2/3)×(5/4)-1/6
=2-5/6-1/6
=2-(5/6+1/6)
=2-1
=1;
5/6×[3/4－﹙7/16－1/4﹚
=(5/6)×(3/4-7/16+1/4)
=(5/6)×(1-7/16)
=(5/6)×(9/16)
=15/32;

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Answer 2

1375＋450÷18
解，得：
==1375+25
==1400

2.84＋5.6－0.84＋4.4
解，得：
==2+0.84＋5.6－0.84＋4.4
==2＋5.6＋4.4
==2+10
==12

2/3×5/8﹢1/3×5/8
解，得：
==(5/8)*[(2/3)+(1/3)]
==(5/8)*1
==5/8

（20.1－21×6/7﹚÷7
解，得：
==（20.1－18﹚÷7
==2.1/7
==0.3

2－2/3÷4/5－1/6
解，得：
==2-(5/6)-(1/6)
==2-[(5/6)+(1/6)]
==2-1
==1

5/6×[3/4－﹙7/16－1/4﹚]
解，得：
==5/6×[3/4－7/16+1/4]
==5/6×（1－7/16）
==5/6×（9/16）
==15/32

Answer 3

1375＋450÷18
=1375＋450÷9÷2
=1375+25
=1400
2.84＋5.6－0.84＋4.4
=(2.84-0.84)+(5.6+4.4)
=2+10
=12
2/3×5/8﹢1/3×5/8
=(2/3+1/3)×5/8
=1×5/8
=5/8
（20.1－21×6/7﹚÷7
=（20.1-18）÷7
=2.1÷7
=0.3
2－2/3÷4/5－1/6
=2-5/6-1/6
=2-（5/6+1/6）
=2-1
=1
5/6×[3/4－﹙7/16－1/4﹚
=5/6×[3/4+1/4-7/16]
=5/6×[1-7/16]
=5/6×9/16
=15/32