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六年级下册数学课堂作业本第21页答案谢谢
人气:405 ℃ 时间:2019-08-21 09:10:59
解答
1:500000
75cm
72km
180km=18000000cm
50km=5000000cm
18000000除以5000000=3.6cm
50m=5000cm
30m=3000cm
5000除以2000=2.5cm
3000除以2000=1.5cm
150m=5000cm
30m=3000cm
45000cm=450m
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