1/ a) Tìm số tự nhiên x,y biết: 7 (x-2017)^2 =23-y^2 b) Cho đa thức f(x) thỏa mãn f(x)+x.f(-x)=x+1 với mọi giá trị của x. Tính f(1). 2/ Tìm giá trị lớn nhất (nhỏ nhất) của các biểu thức: a) A = ( 2x - 3)^2 + (y-1/2)^2+2017 b) B = -1/ 2(x+1)^2 +1 Chọn 1 trong 2 bài

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