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沙发
楼主 |
发表于 2012-6-1 22:21:15
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只看该作者
【计算】 1.难度:★★
(1)2003×2001÷111+2003×73÷37
(2)412×0.81+11×+53.7×1.9
【分析】
(1)原式=2003×2001÷111+2003×73×3÷(37×3)
=2003×(2001+73×3)÷111
=2003×2220÷111=40060
(2)原式=41.2×8.1+11×(9+0.25)+(41.2+12.5)×1.9
=41.2×8.1+41.2×1.9+12.5×1.9+11×9+11×0.25
=41.2×(8.1+1.9)+(10+2.5)×1.9+99+11×0.25
=412+10×1.9+2.5×1.9+99+11×0.25=412+19+99+(11+19)×0.25
=410+2+20-1+100-1+7.5=537.5
2.难度:★★★
【分析】
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