Răspuns :

Explicație pas cu pas:

3x3+(3+3)x[3+(3:3+3)X3]=99

9+6x[3+(1+3)X3]=99

9+6x(3+4x3)=99

9+6x(3+12)=99

9+6x15=99

9+90=99

99=99 (A)

(6x6-6):[(6-6:6)+6x(6:6)-6]=6

(36-6):[(6-1)+6x1-6]=6

30:(5+6-6)=6

30:(11-6)=6

30:5=6

6=6. (A)