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373 2简便运算

373x3简便运算373x3=3*(300+70+3)=3*300+3*70+3*3=900+210+9=1119

373-73-27=373-(73+27)=373-100=273

373*9-73*9=9*(373-73)=9*300=2700

解:373-129+29 =373-100-29+29 =373-100 =273

521+(373-212)=521+161=682

简便方法如下:373+295+63=373+63+295=400+295=695

答:373+27x16-68 =373+(30-3)x16-68 =373+480-48-68 =700+73+80-100-16 =600+73+64 =600+137 =737

373562 +427=373+427562 =800-562=238

373一219+281=373+1-219-1+281=374-220+281=374+61=435

512+(373-212)=512+373-212=512-212+373.=300+373=673

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