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1、一、直接写出计算结果。0.7510=1.28=0.85=4.23=20.16=101.8=0.254=0.245=1.243=0.20.3=5.214=10.806=1.51.2=7.70.1+7.23=0.31.2=2.50.4=0.180.3=0.1440=3.54=13.10.2=100.25=2.42=9.60=1.254=0.652=0.25754=10.12.5=5.282.55=2.50.6=8.80.2=1.37=180.5=0.71.1=6.9560=1.25322.5=二、列竖式计算。1.257=7.31.2=3.772.1=3.22.4=2.75.3=0.250.08=0
2、.30.4=1.250.2=1000.25980.252=7.1213=2.285=4.81.5=6.22.8=0.253.6=38.42.3=4.31.7=0.50.16=8.022.8=1.83.4=28.59.8=2.40.18=3.61.5=0.562.9=1.67.5=2.10.78=6.253.7=1.063.1=9.845.06=3.1082.5=三、用简便方法计算。991017.80.81.251.25（8+0.8）500.130.2260.73+15.122.45-2.450.87017.2+1022-1.671.83+3.791.210.052.4=5.432.12=9.91018+10）12.52.51012.51.22.5+0.82.53.451.22.253.62.8+2.715.784-43.780.2513.70.4100.340.667502.15=4.0563.12=1255381.74.2+1.75.88.7147+8.71531.012.60.551.225.6+17.22.52513+0.90.894.8+0.895.20.29102（