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1/2+1/8+1/32+1/128+1/512 (/=phan)
cho hinh chu nhat co chu vi bang 240m neu viet them 1 chu so vao ben trai so do chieu rong thi hinh chu nhat nay se tro thanh hinh vuong.tim dien tich hinh chu nhat
cho hinh chu nhat co chu vi bang 240m neu viet them 1 chu so vao ben trai so do chieu rong thi hinh chu nhat nay se tro thanh hinh vuong.tim dien tich hinh chu nhat