- Mom, I will eat less fast food this year, believe me.
- If you make a ________, you must keep it.
A:joke
B:noise
C:mistake
D:promise
已知函数fx(x∈R)是偶函数,且f2+x=f2-x,当x∈0,2时,fx=1-x,则方程fx=11-x在区间-10,10上的解的个数是( )