Question

已知:a和b互为相反数,且(a+3)^2-(b+3)^2=6,求a和b的值

Answer 1

因为a和b互为相反数,所以a=-b (a+3)^2-(b+3)^2=6 (-b+3)^2-(b+3)^2=6 b*b+9-6b-(b*b+9+6b)=6 -12b=6 解得b=-1/2 a=-b=1/2