_kakasi

Minh thay co mot so pt bac bon voi cach giai gan nhu duy nhat la phan tich vt thanh tich cua 2 tam thuc bac 2. Nhug neu duh hso bat dinh thi qua lau va rac roi. Vay co cach tiep can nao hay hon ko? Vi du nhu bai nay: 18t^4-18t^3-17t^2-8t-2=0.