2756-2478+1478+244 612-375+275+(388+286) 756+1478+346-(256+278)-246 用脱式计算
2016-05-02
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2756-2478+1478+244
= (2756+244)-(2478-1478)
= 3000-1000
= 2000
612-375+275+(388+286)
= 612-375+275+388+286
= (612+388)-(375+275)+286
= 1000-100+286
= 1000+186
= 1186
756+1478+346-(256+278)-246
= 756+1478+346-256-278-246
= (756-256)+(1478-278)+(346-246)
= 500+1200+100
= 1800
= (2756+244)-(2478-1478)
= 3000-1000
= 2000
612-375+275+(388+286)
= 612-375+275+388+286
= (612+388)-(375+275)+286
= 1000-100+286
= 1000+186
= 1186
756+1478+346-(256+278)-246
= 756+1478+346-256-278-246
= (756-256)+(1478-278)+(346-246)
= 500+1200+100
= 1800
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