수학공부의신9가40쪽셀프1.⑴○⑵×2.2/기본7:12,12,12,3/확인7:⑴3⑵4⑶3⑷1/기본8:1,2,-2,-1,2,3,2,2,2-루트2/확인8:⑴루트7-2⑵3루트2-4⑶루트3-1⑷2-루트2/41
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