√(3×3)+ 3 = 6

√4+√4+√4 = 6

5+5÷5 = 6

6+6-6 = 6

7-7÷7 = 6

√8+? √8+? √8 = 6

(9+9)÷√9 = 6

People who do the topic of preventing Alzheimer's disease don't have to go to school, and of course they don't have to go to Tsinghua Peking University.