问一道SAT数学题.
If v and x are positive integers such that v=7/3 b b=x²\2
what is the least possible value of
A 14
B 21
C 28
D 35
E 42
人气：357 ℃ 时间：2020-05-31 20:39:09
解答
v、x 都是正整数,且v、x的关系为v=7/3 bb=x²\2,消去b得：v=7x²/6
x=6最小,为42
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