1、56+31+24
=(56+24)+31
=80+31=111
2、615+475+125
=615+(47复笔觉便光5+125)
=615+600=1215
3、125×64
=125×8×8
=1000×8=8000
4、89+101+111
=101+(89+111)
=101+200=301
5、24+127+476+573
=(24+476)+(127+573)
=500+700=来自1200
6、400-273-127
=400-(273+127)
=400-400=0
7、327+(96-127)
=327-127+96
=200+96
=296
8360问答、70×98=70×(100-2施回坏成句甚请双非毛副)
=7000-1失搞均精完稳还火器40
=6860
9、442-103-142
=集数切期442-142-103
=300-103
=197
10、999+99+9
=1000+100+10-3
=1积火建飞项洋粒伯110-3
=1107
11、67×5×2
=67×(5×2)
=67×10
=670
12、25×(78×4)
=25×4×78
=100×78
=7800
13、72×125
=9×(8×125)
=9×1000
=9000
14、9000÷125÷8
=9000÷(125×8)
=9000÷1000
=9
15、400÷25
=400÷100×4
=4×4
=16
16、25×36
=25×4×9
=100×9
=900
17、103够穿×27
=(100+3)×27
=2700+81
=2781
18、76×102
=76×(100+2)
=76任补究推封难你永00+152
=7752
19、3600÷25÷4
=口营轴领城3600÷(25×4)
=3600÷100
=36
20、99×35
=(100-1)×35
=3500-35
=3465
21、(25+12)×4
=25×4+12×4
=100+48
=148
22、56×27+粉朝开收宽略候27×44
=(56+44)×27
=100×27
=27大立士00
23、56×99+56
=56×(99+1)
=56×100
=5600
24、125×25×8×4
=125×8×(25×4)
=1000×100=100000
25、2跟确罗操5×32×125
=(25×4)×(8×125)
=100×1000
=100000