Mathematics
Senior High

なぜこれが成り立つのかが分かりません。解説お願いいたします🙇‍♀️

参考 一般に, Of 192 A<x<B C<y<D {A ならば A+C<x+y<B+D {A+ A-D <x-y<B-C が成り立つ。

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