Mathematics
Senior High
緑のマーカーでぬった
(i)と(ii)がなぜそうなるのかわからないです
(［x＋y］=［x］＋［y］
［x＋y］=［x］＋［y］＋1
の部分が何故そうなるのかわかりません)
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