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

(1)12÷[(58?12)×13]=12÷[18×13]=12÷124=12;(2)(23?47)×21+45=23×21?47×21+45=14-12+45=2+45=245;(3)(7?6×23)÷79=(7?4)÷79=3÷79=277;(4)(78?14)÷(59?13)=58÷29=4516.

(1)603-(58+21×7)=603-(58+147)=603-205=398;(2)(27+33)×13-46=60×13-46=780-46=734;(3)(975-300)÷(300÷12)=675÷25=27;(4)45+(55÷5)-20=45+11-20=56-20=36;(5)532+342÷18×52=532+19×52=532+988=1520;(6)5400÷(210...

(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)(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,...

(1)44×20-840÷21,=880-40,=840;(2)45×13×4,=585×4,=2340;(3)588÷(123-119),=588÷4,=147;(4)900÷25×4,=36×4,=144.

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