hjhj de thui ma. dau tien ban lay 1 diem co toa do (1;1). +theo dl Py-ta-go ta tinh duoc duong cheo la can2. +Quay 1 cung tron (O;can2). +diem nay cat Ox o dau thi do la diem can2 la diem C. +Dong thang len diem co tung do bang 1 ta duoc diem D. +theo dl Py-ta-go ta ting duoc duong cheo OD=can3. +Quay 1 cung tron (O;can3) . +diem nay cat Oy o dau do la can3. +Tu do ta xac dinh duoc diem A(1;can3). Vi do thi hs y=can3.x luon đi qua goc ta do nen ta chj can noi O voi A va keo dai ra thi se duoc do thi cua ham so y=can3.x. Theo minh hieu la nhu vay,co the minh dien dat cung chua chuan lam dau.Neu co j sai sot xin moi nguoi cung gop y & sua chua nhe! ^ _ ^