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怎样简便计算就怎样算.55×92125×3228×253000÷8÷125887×64-64×7871022-478-422563+234-463+26699×46+46346+237+54125×48×5×3172×101-72.

题目详情
怎样简便计算就怎样算.
55×92             

125×32          

28×25
3000÷8÷125               887×64-64×7871022-478-422
563+234-463+26699×46+46                     346+237+54
125×48×5×31               72×101-72.
▼优质解答
答案和解析
(1)55×92 
=55×(100-8)
=55×100-55×8
=5500-440
=5060

(2)125×32    
=125×8×4
=(125×8)×4
=1000×4
=4000

(3)28×25
=7×4×25
=7×(4×25)
=7×100
=700

(4)3000÷8÷125      
=3000÷(8×125)
=3000÷1000
=3

(5)887×64-64×787
=(887-787)×64
=100×64
=6400

(6)1022-478-422
=1022-(478+422)
=1022-900
=122

(7)563+234-463+266
=(563-463)+(234+266)
=100+500
=600

(8)99×46+46 
=(99+1)×46
=100×46
=4600

(9)346+237+54
=(346+54)+237
=400+237
=637

(10)125×48×5×31   
=125×8×6×5×31
=(125×8)×(6×5)×31
=1000×30×31
=30000×31
=930000 

(11)72×101-72
=72×(101-1)
=72×100
=7200