Question

脱式计算（能简算的要简算）

127 －(57 +12 ) [1-(14 +38 )]÷1/4 18 ×58+18 ×42 45 ×47 ×54 －13 59 ×6+49 ÷16 180÷2.5÷4
sorry,刚才打错了。12/7 －(5/7 +1/2 ) [1-(1/4 +3/8 )]÷1/4 1/8 ×58+1/8 ×42 4/5 ×4/7 ×5/4 －1/3 5/9 ×6+4/9 ÷1/6 180÷2.5÷4

Answer 1

127 -(57 +12 )
=127-57-12
=70-12
=58
[1-(14 +38 )]÷1/4
= 4-52*4

= (60-1)*6+49/16
=360-6+3又16分之1
=354+3又16分之1
=357又16分之1
180÷2.5÷4

=180÷(2.5*4)
=180÷10
=18
白做了半天！

12/7 －(5/7 +1/2 )
=（12-5）/7-1/2
=1-1/2
=1/2
[1-(1/4 +3/8 )]÷1/4
= 4-1-3/2
=3-3/2
=1又2分之1
1/8 ×58+1/8 ×42
=(1/8)*(58+42)
=100/8
=25/2
=12.5
4/5 ×4/7 ×5/4 -1/3
=4/7-1/3
=(12-7)/21
=5/21
5/9 ×6+4/9 ÷1/6
=6*(5/9+4/9)
=6
180÷2.5÷4
=180÷(2.5*4)
=180÷10
=18

做了两遍，如有帮助可采纳。

追问

sorry,刚才打错了。12/7 －(5/7 +1/2 ) [1-(1/4 +3/8 )]÷1/4 1/8 ×58+1/8 ×42 4/5 ×4/7 ×5/4 －1/3 5/9 ×6+4/9 ÷1/6 180÷2.5÷4

Answer 2

12/7 －(5/7 +1/2 )
= 12/7 －5/7 -1/2
=1/2
[1-(1/4 +3/8 )]÷1/4
=3/8 *4
=3/2
1/8 ×58+1/8 ×42
= 1/8 ×(58+42 )
=1/8 ×100
=12.5
4/5 ×4/7 ×5/4 －1/3
= 4/7 －1/3
=5/21
5/9 ×6+4/9 ÷1/6
= ( 5/9 +4/9 )*6
=6
180÷2.5÷4
=180÷(2.5*4)
=180÷10
=18
做两次。请采纳吧。

追问

sorry,刚才打错了。12/7 －(5/7 +1/2 ) [1-(1/4 +3/8 )]÷1/4 1/8 ×58+1/8 ×42 4/5 ×4/7 ×5/4 －1/3 5/9 ×6+4/9 ÷1/6 180÷2.5÷4