解答:A=a6x^6+a5x^5+a4*x^4+a3*x^3+a2*x^2+a1*x+a0B=b6*x^6+b5*x^5+b4*x^4+b3*x^3+b2*x^2+b1*x+b0∴ A+B=(a6+b6)*x^6+(a5+b5)*x^5+(a4+b4)*x^4+(a3+b3)*x^3+(a2+b2)*x^2+(a1+b1)*x+a0+b0显然次数不能高于6,但是可以不是6次,比如a6+b6=0时,选C:次数不高于6次的整式
C.次数不高于6次的整式