53×47-280÷35
=(50+3)(50-3)-8
=2500-9-8
=2483
29×27-27×9
=(29-9)×27
=20×27
=540
25×27×40
=25×4×27×10
=100×270
=27000
(132+18)÷(40-15)
=150÷25
=6
522÷【(301-299)×29】
=522÷(2×29)
=522÷2÷29
=9
202+135+198
=(202+198)+135
=400+135
=535
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。
能简算的要简算(脱式计算)
能简算的要简算(脱式计算) 53×47-280÷35 =(50+3)(50-3)-8 =2500-9-8 =2483 29×27-27×9 =(29-9)×27 =20×27 =540 25×27×40 =25×4×27×10 =100×270 =27000 (132+18)÷(40-15) =150÷25 =6 522÷【(301-299)×29】 =522...
能简算的要简算(脱式计算)
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