1.The greatest common divisor of a and b is 21, and the least common multiple of a and b is 126, where a and b are positive integers, what is the sum of a and b?
數學疑問？ 1.The greatest common divisor of a and b is 21, and the least common multiple of a and b is 126, where a and b are positive integers, what is the sum of a and b?
A. 105 B. 147 C.150 D.105or 147 E.105or 150
21=3*7 126=2*3^(2)*7 A,B均含3*7 為滿足the least common multiple of a and b is 126 A, B可為3*7*2, 3*7*3 或是3*7, 2*3^(2)*7
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发表于 2010-10-2 10:24:37
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