答案应该是81.
但是,请仔细审题,如果答案的选项是：27（这个27外面有方框）,那么正确答案应该是27（方框）.因为81＝27（方框）＝27×3.
gmat prep数学prep里有这样一道数学题.for all the positive integers m, m(
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