数学综合运算的技巧主要有以下几种: 1. 加减乘除法的运算技巧,主要是提取公因数; 2. 将数据进行拆分重组,进行运算; 3. 对数据进行凑整处理。 下面和大家分享几个技巧: 举例: (1) 68 + 29 + 36 + 54 + 21 + 74 + 102 = (68 + 102) + (29 + 21) + (36 + 54) + 74 = 170 + 50 + 90 + 74 = 384 (2) 756 - 248 - 352 = 756 - (248 + 352) = 756 - 600 = 156 (3) 8 + 88 + 888 + 8888 = (10 - 2) + (90 - 2) + (900 - 12) + (9000 - 112) = 10000 - 128 = 9872 (4) 39 +38 + 40 + 41 + 43 = (40 - 1) + (40 - 2) + 40 + (40 + 1) + (40 + 3) = 40 * 5 - 1 - 2 + 1 + 3 = 201 乘除法混合运算技巧 例题: (1) 25 × 16 ÷ 20 = 25 × 4 × 4 ÷ 20 = 400 ÷ 20 = 20 (2) 1200 ÷ 4 ÷ 5 ÷ 5 = 1200 ÷ (4 × 5 × 5) = 1200 ÷ 100 = 12 (3) 1300 × 77 ÷ 100 = 13 × 100 × 7 × 11 ÷ 100 = 7 × 11 × 13 = 1001 今天先和大家分享到这里,希望大家喜欢,谢谢 |
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