Question

Cat face (3×9+9÷a)+5×4÷2(12-4×2)=6×6

Answer 1

(3×9+9:a)+5×4:2-(12-4×2)=6×6
(27+9:a)+5×4:2-(12-8)=36
(27+9:a)+5×4:2-4=36
(27×9:a)+20:2-4=36
(27×9:a)+10-4=36
(27+9:a)+6=36
27+9:a=36-6
27+9:a=30
9:a=30-27
9:a=3
a=9:3
a=3

Answer 2

( 3 x 9 + 9 : a ) + 5 x 4 : 2 - ( 12 - 4 x 2 ) = 6 x 6

( 27 + 9 : a ) + 20 : 2 - ( 12 - 8 ) = 36

( 27 + 9 : a ) + 10 - 4 = 36

27 + 9 : a = 36 + 4 - 10 → metoda mersului invers

27 + 9 : a = 40 - 10

27 + 9 : a = 30

9 : a = 30 - 27

9 : a = 3

a = 9 : 3

a = 3 → numarul necunoscut