Question

已知a*a-6a+4b*b+8b+13=0求a的b次方

Answer 1

a^2-6a+4b^2+8b+13=0,配方得:(a^2-6a+9)+(4b^2+8b+4)=0,即:(a-3)^2+(2b+2)=0,所以:a-3=2b+2=0,解得:a=3,b=-1,所以:a^b=3^(-1)=1/3