五年级下册数学书练习九54页和55页的答案。帮帮忙，这是今天的家庭作业！！！！！！！！！！！！！！！！
推荐回答（3个）
7、15厘米=1.5分米
原高：5.5÷（2×2）=1.375分米
2×2×（1.5-13.75）=0.5立方分米
8、8.04立方分米=8.04升=8040毫升
2750立方厘米=2750毫升=2.75升
7.5升=7.5立方分米=7500立方厘米
785毫升=785立方厘米=0.785立方分米
9、700毫升=0.7升
14÷0.7=20分钟
10、400×225×300=27000000立方毫米=27立方分米=27升
11、80000÷（50×25×1.2）=53.33≈53个
12、略
13、18.6×2.1=39.06立方米
14、13×2.7×1.5×1.33=70.0245吨
15、22×10×1.8=396立方米
16、（24-12）÷3=4毫升
12-4=8毫升
人教课标版下 练习九：
1、它们的容积不一样大，体积相同的盒了，由于盒子壁的厚度不同，因此容积也不同。
2、3×2.5×2=15平方米
3、mL L 平方米
4、2500 0.6 3250 0.45
5、87.5×50×56=24500平方厘米=245L
6、1500 ml=1.5L 18÷1.5=12瓶
7、15cm=1.5dm 5.5L=5.5平方分米
2×2×1.5-5.5=0.5平方分米
8、8.04 8040 2750 2.75 7.5 7500 785 0.785
9、700 mL=0.7L 14÷0.7=20分钟
10、炉腔内部尺寸就是微波炉的长宽高。计算时不要忘了换算单位。
400×225×300=27000000立方毫米
27000000立方毫米=27立方分米=27L
11、80000÷(50×25×1.2) ≈53个
12、如果是柔软可变形的物体，可以捏成长方体或正方体，然后用尺子测出所需数据，就可以求出体积。如果是不可变形的物体则可用排水法。
13、18.6×2.1=39.06立方米
14、1.33×（13×2.7×1.5）=70.0245吨
15、22×10×1.8=396立方米
16、当放入一个大球和一个小球时，排出水12 mL；当放入一个大球和4个小球，排出水24mL，可以求出3个小球的排水量，即三个小球的体积。三个小球的体积除以3得出一个小球的体积，最后求大球的体积
24mL=24立方厘米 12mL=12立方厘米
小：（24-12）÷3=4立方厘米
大：12-4=8立方厘米
1. 28cm=2.8dm 20cm=2dm
11.76 除 2.8 除 2 =2.1（dm）
2.1dm=21cm
25cm < 28cm 16cm < 20cm 18cm < 2.1cm
答:能够装下。
3. 3×3=9立方厘米
6m=600cm 2.7m=270cm 600×270×6÷9=108000块
答：用了108000块积木。
4．104×44×4.6=21049.6立方厘米
44×4.6×35×2=14168立方厘米
(21049.6+14168)×50=1760880立方厘米=1760.88立方分米=1.76088方
答:共用混凝土1.76088方。
6． 24cm=0.24m
15×0.24×3=10.8立方米
10.8×525=5670块
答:一共用砖5670块。
7. (6+4+5)×4=60dm
60÷12=5dm
6×4×5=120立方分米 5×5×5=125立方分米
2. 8×8×(7-6)=64立方厘米 答：珊瑚石的体积是64立方厘米
8．8.04立方分米=8.04升=8040毫升 2750立方厘米=2750毫升=2.75升
7.5升=7.5立方分米=7500立方厘米 785毫升=785立方厘米=0.785立方分米
9. 700毫升=0.7升 14÷0.7=20分钟 答;喷完一箱药液要20分钟。
10. 400×225×300=27000000立方毫米=27立方分米=27升
答：容积是27升。
11．80000÷（50×25×1.2）=53.33≈53个 答：53个。
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