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简便运算(讲解)(1)585+189+215 (2) 5.85+1.89+2.15 (3) 7.54.96.5 (4)15.89(6.755.89) (1)36.541.764.54 (2)147.322.68 (3)4.56-(2.56-0.32) (4)12.7(3.70.84)(1)3.8+1.37+6.2+12.63 (2)5.272.860.661.63(3)3.94.16.15.9 (4)4.58+2.39+(5.42+7.61)(1)10299 (2) 3.6102 (3) 4.8100.1(1)(2.50.25)0.4 (2)(7.71.54)0.7 (1)2399+23 (2) 7.0910.80.87.09 (3) 4.87.8780.52 (4) 56.59.956.5 (5)8.70.5+1.322(1)15.613.115.615.62.1(1)0.250.734 (2) 0.8(4.31.25) (3)0.254.8(1)0.351.2520.8(1)3.522.50.4 (2)17.8(1.784)(1)0.491.4 (2)4.51.8