Mathematics
Senior High
この解答の、2段目の中かっこを外した時になぜ2乗が付くのかが分かりません。
(2上55?上6)(z2T5%)
(*2十5?)2十6(z2十5%)
(*4二10*?上25%9二6ヶ2十30*
ニッ*二10*?二31z2十30*
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