Cho f(x) = x^2 + 2x^3− 7x^5 − 9 − 6x^7 + x^3 + x^2 + x^5 − 4x^2 + 3x^7

Cho

f(x)=x2+2x3-7x5-9-6x7+x3+x2+x5-4x2+3x7g(x)=x5+2x3-5x8-x7+x3+4x2-5x7+x4-4x2-x6-12h(x)=x+4x5-5x6-x7+4x3+x2-2x7+x6-4x2-7x7+x

Tính f(x) + g(x) – h(x)