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单选题
If a and b are positive integers such that (a-4)(b-5) = 0, what is the least possible value of a + b?
A
5
B
6
C
8
D
10
E
11
参考答案
参考解析
解析:
如果(a-4)(b-5) = 0,所以(a-4) = 0或(b-5) =0,或两者都等于0,a = 4 或b = 5.,如果要使a + b的值最小,我们应该假设a=4,那么b可以为任何值,又因为b的值为正整数,所以b的最小值为1,所以a + b最小的可能值为4+1=5。
如果(a-4)(b-5) = 0,所以(a-4) = 0或(b-5) =0,或两者都等于0,a = 4 或b = 5.,如果要使a + b的值最小,我们应该假设a=4,那么b可以为任何值,又因为b的值为正整数,所以b的最小值为1,所以a + b最小的可能值为4+1=5。
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