小數(shù)混合運算計算題

1、2、列豎式計算。（6分）（1）2.583.5（2）3.5720.47（3）329223、解方程。（12分）（1）5x＝450（2）12（6－x）＝42（3）1.264x＝12（4）8.5x－x＝22.54、用簡便方法計算。（8分）（1）0.253.212.5（2）3610.1（3）0.2544（4）22.2417.845、用遞等式計算。（12分）（1）2.61.41.5－1.5（2）（37－3.64.8）12.5（3）2.62.4（1.

2、4－1.05）（4）15.616（0.251.25）30.8[14(9.851.07)][60(9.528.9)]0.182.8810.430.243.520[(2.441.8)0.40.15]28(3.41.252.4)2.557.12.457.17779111130.8[15.5(3.215.79)](31.83.24)531.54(63)0.64257.82.222.52.5236.254.259.95180－7056242.4－

3、2.50.8(41212389)76711597446912149219.46.12.35.670.20.6218.10.923.930.40.70.250.785.43614.854149.9x565610.34x891314.31x565616.59x1814x2720.3x291335.95（6445）36.17814556427.20.81.256.5（4.81.24）28(3.41.252.4)2.557.12.457.177

4、7911113（31.83.24）531.54(63)0.64257.82.222.52.52194－64.81.80.936.724.259.95180－7056242.4－2.50.8(41212389)767115974469121492405(32133189)19.46.12.35.670.20.6218.10.923.930.043240.8750.40.70.250.785.43614.070.869.1224078（15

5、4115）143727＋27563〔75（1218）〕152160〔（8379）18〕280＋84024532513(266－250)85(95－144024)(6.86.80.55)8.50.124.80.124.8（3.21.52.5）1.63.2（1.52.5）1.631.50＋16040（58370）（6445）32.120144183533.34745241605234（5837）（6495）35.95（6445）36.178

6、1455642420580642128812700（93111）（13664）（6534523）（28416）（512820818）1203641835（5837）（6495）(6.86.80.55)8.50.124.80.124.8（3.21.52.5）1.6（23.2（1.52.5）1.645.61.64=5.387.855.37=46.70.81.25=61.1930.43=47.6.5（4.81.24）=0.681.90.321