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脱式计算.12÷[(58?12)×13] (23?47)×21+45 (7?...

(1)45.55-(6.82+15.55) (2)34.52-17.87-12.23(3)6.43-(1.4-0.57) (4)23.75-8.64-3.46(5)17.83-9.5-7.83-0.5 (6)5.38+88.2-2.38+1.8(7)27.38-5.34+2.62-4.66 (8)21.63-(8.5+9.63) (9)7.5-2.45+7.5+2.45 (10)0.9+0.99+0....

(1)1.18×2.58+0.5+1.42×1.18=1.18×(2.58+1.42)+0.5=1.18×4+0.5=4.72+0.5=5.22;(2)(21.85-17.5)×(0.45÷0.9)=4.35×0.5=2.175;(3)1.75×(0.1÷0.2)-0.18÷0.9=1.75×0.5-0.2=0.875-0.2=0.675;(4)93.6÷[(54.8+45.2)×(6-5.46)]=93...

①8400÷84+15×36,=100+540,=640;②540÷(38-29)×13,=540÷9×13,=60×13,=780;③455+65×(273÷21),=455+65×13,=455+845,=1300;④(350-270÷45)×23,=(350-6)×23,=344×23,=7912.

(1)(45+14)÷73+710,=2120÷73+710,=920+1420,=2320;(2)519×14+1319×14,=(519+1319)×14,=1819×14,=938;(3)7.6×35%+6.5×0.76,=7.6×0.35+0.65×7.6,=7.6×(0.35+0.65),=7.6×1,=7.6;(4)1349×21+13×2849,=2149×13+13×2849,...

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