脱式计算(能简算的要简算):62.8×19-8×6245-62453.64×[1÷(2110-2.09)]1800-1350÷18×6(2512+158+2712+3.375)×3201.9-1.9×(1.9-1.9)(1-1%×70)÷27.
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10 |
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12 |
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8 |
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20 |
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20 |
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2 |
7 |
7 |
10 |
7 |
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21 |
20 |
脱式计算(能简算的要简算):62.8×19-8×6245-62453.64×[1÷(21...
(1)62.8×19-8×6245-6245,=62.8×(19-8-1),=62.8×10,=628;(2)3.64×[1÷(2110-2.09)],=3.64×[1÷0.01],=3.64×100,=364;(3)1800-1350÷18×6,=1800-75×6,=1800-450,=1350;(4)(2512+ 158 +2712+3.375)×320,=(5+5)×320,=32;...