简便计算
1125-997998+1246+998925除以100又26分之253.8/3.9+3.9/0.1+0.1/3.9...
1125-997 998+1246+9989 25除以100又26分之25
3.8/3.9+3.9/0.1+0.1/3.9 展开
3.8/3.9+3.9/0.1+0.1/3.9 展开
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1125-997
=1125-(1000-3)
=1125-1000+3
=125+3
=128
998+1246+9989
=(1000-2)+(1250-4)+(10000-11)
=1000+1250+10000-2-4-11
=12250-17
=12233
25/(100+25/26)
=25/[(100*26+25)/26]
=25*26/(4*25*26+25)
=25*26/[25*(4*26+1)]
=26/105
3.8/3.9+3.9/0.1+0.1/3.9
=(3.8/3.9+0.1/3.9)+3.9*10/0.1*10
=(3.8+0.1)/3.9+39
=3.9/3.9+39
=1+39
=40
=1125-(1000-3)
=1125-1000+3
=125+3
=128
998+1246+9989
=(1000-2)+(1250-4)+(10000-11)
=1000+1250+10000-2-4-11
=12250-17
=12233
25/(100+25/26)
=25/[(100*26+25)/26]
=25*26/(4*25*26+25)
=25*26/[25*(4*26+1)]
=26/105
3.8/3.9+3.9/0.1+0.1/3.9
=(3.8/3.9+0.1/3.9)+3.9*10/0.1*10
=(3.8+0.1)/3.9+39
=3.9/3.9+39
=1+39
=40
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