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1、脫式計算（能用簡便算法的用簡便算法）3.760.25+25.8 21.360.8-12.9 0.254.7840.65201 7.28+3.22.5 4.80.25 5.2991.080.80.27 2.330.54 63.42.50.4 1.258.844.280.94.1 2.70.83.4 1.25320.25 0.25363.249+0.132.4 12.33.1+5.6 4.69.7+5.49.72.4102 0.85199 36.4-6.45.3 5.912.8-2.85.99.80.6-1.21.2 7.83.3+5.77.8+7.8 3.12+3.129916-2.546 21

2、3.60.80.3 0.8615.7-0.8614.7（2.5-0.25）0.4 28.6101-28.6 0.250.1+0.751042（5.250.25） 2532125 （375+135）158.28-(2.28+0.14) 10.6-7.91+3.4-2.09 26.85+4.26-3.8564.8-2.64-14.8-4.36 5.1-（4.1+0.33） 23.9-0.60.6-0.646.8240.25 26+（89+74） 2.50.82+6.50.82+0.827.7520（3.24-3.04） 3.640.130.9 16.29.9+1.626.244+3.760.25 9.91+42.1-8.91 4.25-(1.7-2.75)-1.3 8.80.125 (4.9+6.3)0.78.29.9+820.01 4.60.25+5.44 14.62-(6.62-1.34)16.25(41.60.13) ( 3.8-7.7)2.5740.5