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很实用的简便运算习题30.814(9.851.07)60(9.528.9)0.182.8810.430.243.520(2.441.8)0.40.1528-(3.4+1.252.4)2.557.1+2.457.17779+111130.815.5-(3.21+5.79)（31.8+3.24）531.54(6+3)0.64257.8+2.222.5+2.5219464.81.80.936.724.259.951807056242.42.50.8(4121+2389)767115-9740.87.9-(2+5)46912+1492405(3213-3189)3.416（0.01635）0.8(106.76)1.2101.30.321024+0.243.20.6150.151.90.020.40.51.2582.540.2442000.160.60.1
