面包屑
发表于 2025-3-28 17:53:28
Wayne T. Padgett,David V. AndersonLet . be any real number. By the ., in notation |.|, we mean . if . ≥ 0 and — . if . ≤ 0. If we picture . as a point on the number line, then |.| can be viewed as the distance between the points 0 and .. It is obvious that |− .| = |.|.
破译
发表于 2025-3-28 19:27:47
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Interregnum
发表于 2025-3-29 01:59:36
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