Làm hộ 2 bài này 1) a) Tính giá trị lớn nhất của biểu thức T = $\frac{-2|x-2018| - 2021}{2020+|x-2018|}$ 2) a) Cho đa thức h(x) thỏa mãn x.h(x+1) = (x+2) . h(x) . Chứng minh rằng đa thức h(x ) có ít nhất 2 nghiệm b) Tìm các số nguyên x , y biết : 3xy + x + y = 6

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