人教版四年级下册数学练习十七答案课件.pptx

1、小数的加法和减法练习十七及做一做练习十七及做一做答案答案2.98+0.56=3.542.98+0.56=3.54 2.98 2.98 验：验：3.543.54+0.56 -0.56+0.56 -0.56 3.54 2.98 3.54 2.9812.53+4.67=17.212.53+4.67=17.2 12.53 12.53 验：验：17.217.2+4.67 -4.67+4.67 -4.67 17.2 12.53 17.2 12.536.07+4.89=10.966.07+4.89=10.96 6.07 6.07 验：验：10.9610.96+4.89 -4.89+4.89 -4.8910.

2、96 6.0710.96 6.075.64-1.78=3.865.64-1.78=3.86 5.64 5.64 验：验：3.863.86-1.78 +1.78-1.78 +1.78 3.86 5.64 3.86 5.6415.62-7.46=8.1615.62-7.46=8.16 15.62 15.62 验：验：8.168.16-7.46 +7.46-7.46 +7.46 8.16 15.62 8.16 15.627.2-0.8=6.47.2-0.8=6.4 7.2 7.2 验：验：6.46.4-0.8 +0.8-0.8 +0.8 6.4 7.2 6.4 7.2（1）小明从）小明从7岁到岁到1

3、0岁，体重增加岁，体重增加 了多少千克？了多少千克？答：体重增加了答：体重增加了7.1千克。千克。下面是小明的体重统计图。下面是小明的体重统计图。29.822.72 9.8 2 2.77.17.1（千克）（千克）下面是小明的体重统计图。下面是小明的体重统计图。（2）哪一年比上一年增加得最多？）哪一年比上一年增加得最多？增加了多少？增加了多少？24.622.71.9（千克）（千克）27.524.62.9（千克）（千克）29.827.52.3（千克）（千克）2.9千克千克2.3千克千克1.9千克千克答：答：9岁那年比上一年增加得岁那年比上一年增加得 最多，增加了最多，增加了2.9千克。千克。12+

4、0.5=12.512+0.5=12.5 12 12 验：验：12.512.5+0.5 -0.5+0.5 -0.5 12.5 12 12.5 1212.56+5.8=18.3612.56+5.8=18.36 12.56 12.56 验：验：18.3618.36+5.8 -5.8+5.8 -5.8 18.36 12.56 18.36 12.56113.04+7.8=120.84113.04+7.8=120.84 113.04 113.04 验：验：120.84120.84+7.8 -7.8+7.8 -7.8 120.84 113.04 120.84 113.0427-0.8=26.227-0.8=

5、26.2 27 27 验：验：26.226.2-0.8 +0.8-0.8 +0.8 26.2 27 26.2 270.3-0.18=0.120.3-0.18=0.12 0.3 0.3 验：验：0.120.12-0.18 +0.18-0.18 +0.18 0.12 0.3 0.12 0.316.40-3.2=13.216.40-3.2=13.2 16.40 16.40 验：验：13.213.2-3.2 +3.2-3.2 +3.2 13.2 16.4 13.2 16.42.5+0.9=2.5+0.9=3.43.4 7.8+1.6=7.8+1.6=9.49.4 11.7+2=11.7+2=13.71

6、3.7 0.39+0.15=0.39+0.15=0.540.541.2-0.5=1.2-0.5=0.7 0.7 4.7-2.8=4.7-2.8=1.91.9 8.6-5.3=8.6-5.3=3.33.3 0.96-0.33=0.96-0.33=0.630.633.64+0.48=4.123.64+0.48=4.12 3.64 3.64 验：验：4.124.12+0.48 -0.48+0.48 -0.48 4.12 3.64 4.12 3.6421.56+6.74=28.321.56+6.74=28.3 21.56 21.56 验：验：28.328.3+6.74 -6.74+6.74 -6.74

7、 28.3 21.56 28.3 21.567.85+9.19=17.047.85+9.19=17.04 7.85 7.85 验：验：17.0417.04+9.19 -9.19+9.19 -9.1917.04 7.8517.04 7.8541.2-15.6=25.641.2-15.6=25.6 41.2 41.2 验：验：25.625.6-15.6 +15.6-15.6 +15.6 25.6 41.2 25.6 41.211.65-7.39=4.2611.65-7.39=4.26 11.65 11.65 验：验：4.264.26-7.39 +7.39-7.39 +7.39 4.26 11.65

8、 4.26 11.658.24-3.56=4.688.24-3.56=4.68 8.24 8.24 验：验：4.684.68-3.56 +3.56-3.56 +3.56 4.68 8.24 4.68 8.240.95-0.35=0.6(0.95-0.35=0.6(千克千克)答：杯里的水有答：杯里的水有0.60.6千克。千克。163.54163.54元元159.26159.26元元162.8162.8元元160160元元322.8322.8元元10.3210.3216.0816.0820.2420.243.083.0844.344.30.450.45 12.5 12.5 +3.79+3.79 1

9、6.29 16.29 23.4 23.4 -13.4-13.4 10 10 5 5 -1.26-1.26 3.74 3.74 7.16 7.16 -3-3 4.16 4.16 5 5元元6 6角角2 2分分+3+3元零元零9 9分分5.625.62元元+3.09+3.09元元 8.718.71元元1t30kg+980kg1t30kg+980kg=1.03t+0.98t=1.03t+0.98t=2.01t=2.01t4m35cm+5m70cm4m35cm+5m70cm=4.35m+5.7m=4.35m+5.7m=10.05m=10.05m10kg-4kg800g10kg-4kg800g=10kg

10、-4.8kg=10kg-4.8kg=5.2kg=5.2kg4km800m-3km50m4km800m-3km50m=4.8km-3.05km=4.8km-3.05km=1.75km=1.75km6km-2km860m6km-2km860m=6km-2.86km=6km-2.86km=3.14km=3.14km75.80+45.50=121.375.80+45.50=121.3（元）（元）75.80+58.0075.80+58.00133.8133.8（元）（元）92.50+45.50=13892.50+45.50=138（元）（元）92.50+58.0092.50+58.00150.5150.

11、5（元）（元）2.092.091.971.970.120.12（米）（米）7.527.527.017.010.510.51（米）（米）22.6322.6321.7621.760.870.87（米）（米）76.8076.8071.6871.685.125.12（米）（米）72.2872.2863.9263.928.368.36（米）（米）10.7910.7910.4910.490.30.3（秒）（秒）（1 1）0.20.2，0.40.4，0.60.6，0.80.8，1 1，1.21.2。（2 2）1.111.11，1.1 61.1 6，1.211.21，1.2 61.2 6 ，1.311.31 ，1.361.36。（3 3）4.3634.363，4.3664.366，4.3694.369，4.3724.372，4.3754.375，4.3784.378。（4 4）7.8977.897，7.8927.892，7.8877.887，7.8827.882，7.8777.877，7.8727.872。依次增加依次增加0 0.2 2依次增加依次增加0.050.05依次增加依次增加0.0030.003依次减少依次减少0.0050.005