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脱式计算. (1)49+67+59 (2)34?(56?1...

(1)49+67+59,=49+59+67,=1+67,=167;(2)34-(56-13),=34-12,=14;(3)53?27?57,=53-(27+57),=53-1,=23.

(1)3.8×99+38=3.8×100+38-3.8,=380+38-3.8,=414.2;(2)59×56+49÷65=59×56+49×56,=(59+49)×56,=1×56,=56;(3)(1.5-0.6)×(3-1.8)=0.9×1.2,=1.08;(4)711÷[25?(1?710)]=711÷[25?310],=711÷110,=7011;

(1)6-72×23,=6-73,=323;(2)32-(13+15),=32-815,=31715;(3)712+(12+14)×13?56,=712+34×13-56,=712+14-56,=56-56,=0;(4)59-23×34,=59-12,=118.

(1)49×[34-(716-14)]=49×[34-316]=49×916=14;(2)6.25×0.56+58×3.4+5×18=6.25×0.56+58×3.4+5×18=0.625×5.6+0.625×3.4+0.625=0.625×(5.6+3.4+1)=0.625×10=6.25;(3)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(4)2007÷200720072...

(1)3.64÷4+4.36×25%=3.46×14+4.36×14,=(3.46+4.36)×14,=8×14,=2;(2)3.2×25×12.5,=0.8×4×25×12.5,=(4×25)×(12.5×0.8),=100×10,=1000;(3)34÷[56×(37?38)],=34÷[56×356],=34÷3,=14.

(1)44÷45-45÷4=44×54-45×14=55-15=5445(2)(34-56×415)÷1920=(34-29)÷1920=1936×2019=59(3)23÷[611×(23+14)]=23÷[611×1112]=23÷12=23×2=43

(1)67÷[(47-12)×25]=67÷[114×25]=67÷135=67×35=30;(2)1415×25%-1115÷4=1415×14-1115×14=(1415-1115)×14=15×14=120;(3)1.28×2.37-2.8×0.237=1.28×2.37-0.28×2.37=(1.28-0.28)×2.37=1×2.37=2.37;(4)(512+119)×12+719=512×12+11...

(1)2091-2091÷17,=2091-123,=1968;(2)(34-34×25)÷15,=34×(1-25)×5,=34×35×5,=94;(3)1.28×2.37-2.8×0.237=1.28×2.37-0.28×2.37,=(1.28-0.28)×2.37,=1×2.37,=2.37;(4)(512+119)×12+719,=512×12+119×12+719,=5+(1219...

(1)516÷12+67=43+67,=110;(2)[23+(710?16)]÷45=[23+1630]×54,=65×54,=32;(3)(1÷14+14÷1)×8=(4+14)×8,=4×8+14×8,=32+2,=34.

(1)35÷(65÷37),=35÷(65×73),=35÷145,=35×514,=252;(2)38-310×56,=38-14,=18;(3)59×625÷310,=59×625×103,=49.

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