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五年级数学开学必考，小数的简便计算
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2023-02-06
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五年级数学开学必考，小数的简便计算


简介：
0.92×1.41＋0.92×8.59 = 0.92×(1.41+8.59) = 9.2 3.2×12.5×25 = 8×0.4×12.5×25 = 8×12.5×0.4×25 = 1000 5.76＋13.67＋4.24＋6.33 = (5.76＋4.24)＋(13.67＋6.33) =10+20 = 30 34×9.9 = 34×(10－0.1) = 34×10-34×0.1 = 336.6 0.98×2.5 = (1-0.02)×2.5 = 1×2.5-0.02×2.5 = 2.5-0.05 = 2.45 1.4×99+1.4 = 1.4×(99+1) = 1.4×100 = 140 310÷2.5÷4 = 310÷(2.5×4) = 310÷10 = 31 0.25×4.78×4 = 0.25×4×4.78 = 1×4.78 = 4.78