Ny-Ålesund 約3年以前 PQ = 4 PR = 4 + 4.5 = 8.5 QR^2 = 8.5^2 - 4^2 = 72.25 - 16 = 56.25 QR = 7.5 PR + QR = 8.5 + 7.5 = 16 留言