苏教版五年级上册数学练习与测试第17页答案
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9: 3cm=30mm 6cm=60mm 图1 ﹙30+60﹚×30÷2 =120×30÷2 =1350mm
图2 ﹙3+6﹚×6÷2 =9×6÷2 =27cm
图3 3cm=30mm 6cm=60mm ﹙30+60﹚×30÷2 =120×30÷2 =1350mm
图4 ﹙3+6﹚×6÷2 =9×6÷2 =27cm
10: 1800÷﹙24×15﹚ =1800÷360 =5
11 ﹙40+55﹚×40÷2 =95×40÷2 =1900
12: 20×20÷2×18=3600
13: ﹙8+11﹚×4÷2×45 =19×4÷2×45 =1710 1710>1500 不够 |
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