a) Ta có:
f(x)+g(x)=a0xn+a1xn−1+a2xn−2+…+an−1x+an+b0xn+b1xn−1+b2xn−2 +…+bn−1x+bn
=(a0+b0)xn+(a1+b1)xn−1+(a2+b2)xn−2+…+(an−1+bn−1)x+(an+bn)
b) Ta có
f(x)+g(x)=a0xn+a1xn−1+a2xn−2+…+an−1x+an-b0xn+b1xn−1+b2xn−2 +…+bn−1x+bn
=a0xn+a1xn−1+a2xn−2+…+an−1x+an−b0xn−b1xn−1−b2xn−2−…−bn−1x+bn
=(a0−b0)xn+(a1−b1)xn−1+(a2−b2)xn−2+…+(an−1−bn−1)x+(an−bn)
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