问题
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2/5,3/7,4/10,6/14,8/20,12/28,()A.224/56B.14/32C.20/48D.16/40
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2/5,3/7,4/10,6/14,8/20,12/28,() A.224/56B.14/32C.20/48D.16/40
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2/5, 3/7, 4/10, 6/14, 8/20, 12/28,______ () A.224/56 B.14/32 C.20/48 D.16/40
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2/5, 3/7, 4/10, 6/14, 8/20, 12/28, () A.224/56 B.14/32 C.20/48 D.16/40
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正方形的边长扩大14倍,那么其面积扩大()倍。 A.256 B.8 C.196 D.16
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简算:0.25×4.78×40.65×2011.2×2.5+0.8×2.54.8×0.256.53÷0.4÷2.51.8×20.1.