四年级下册小数简便计算.doc

一、列竖式计算。 4.8-2.81.3+2.53.1+2.2226.2-13.112.3+11.2 35.82-13.33.7+2.3615.4+2.9711.65-7.39 10-8.75 5.94+10.7 9.82-6.184.80.25 0.320.8 9.80.5 4.81.20.321.2 9.81.03 0.1250 2.60.5 1.32.29.60.85.04283.820.450.966.9 3.84 480.150.12581.80.850.861.2 120.163.51.22.7+3.63.25-1.140.34 9.6-1.64 81.5762.4+7.626.72.43.051.4 4.8-2.81.3+2.53.1+2.2226.2-13.112.3+11.2 35.82-13.33.7+2.3615.4+2.9711.65-7.3910-8.75 5.94+10.79.82-6.184.80.250.320.89.80.5 4.81.20.321.29.81.030.12502.60.5 1.32.29.60.85.04283.820.450.966.9 3.84480.150.12581.80.850.861.2 120.163.51.22.7+3.63.25-1.140.34 9.6-1.6481.5762.4+7.626.72.43.051.4二、脱式计算，用你喜欢的方法计算（能简便的要简便）。 4.6-1.75+2.087.41-(2.96+3.04)3.2+1.27-2.495-(4.19-2.83) 4.28+0.53-3.371.54+2.08+3.622.85+7.252.513+0.9 2.6+1.430.253.70.4 0.894.8+0.895.21.83+3.79+0.17 10-0.34-0.66 2.50.6-1.80.5(8+0.8)1.25 (15.4-7.8)3.5 4.15+3.24+9.85+6.763.24.6+3.25.412.8+2.049.5 4.53.6+5.20.356.159.4-42 4.50.9+5.50.9 (7.5+2.5)0.25 2.25+1.250.18 7.8+4.56+2.2 0.656.4-0.655.41.3+4.70.9 5.01-1.9+4.99 0.499+0.47.5-7.50.8 1014.8-4.8三、解下列方程。 x-19=2x-12.3=3.86x=1563x=630x-47=47 59+x=120x52= 7x28=03x+6=154x-2=26 8+x=20 3x+4=342x+5=552x+20=50 3x+20=50 X+23.5=454x+9=249 36+2x=48 m0.6=0.454x=36 2.5+x=10 x-18=40 3x-3.9=5.12y+7=918m2=24 X+12=25 x-19=284.5+x=19.2x-15.6=27.4x17=68四、用方程表示下面的数量关系，并解答。 1、比x多7.3的数是12.8。2、24除x的商是0.2。 3、比x的6倍少9的数是27。4、比x多61.7的数是128。 5