5: 美国: 8.4×3.6= 30.24(人)≈30.2(人)
中国: 15.7×8.4=131.88(人)≈131.9(人)
6:(20-1)×2.85+4.9
= 19×2.85+4.9
= 59.05(米)
≈ 59(米)
7: 28.5×2+28.5
= 57+28.5
= 85.5(千克)
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5: 美国: 8.4×3.6= 30.24(人)≈30.2(人)
中国: 15.7×8.4=131.88(人)≈131.9(人)
6:(20-1)×2.85+4.9
= 19×2.85+4.9
= 59.05(米)
≈ 59(米)
7: 28.5×2+28.5
= 57+28.5
= 85.5(千克)
http://m.ksjqmj.com/wunianjidaan/2303.html
推荐访问