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(3×9+0÷10)÷9+9÷(0÷5+5×2÷10)

Răspuns :

= 27 ÷ 9+9÷1 = 3+9 = 12
(3×9+0:10):9+9:(0:5+5×`2:10)=
(27+0):9+9:(0+10:10)=
27:9+9:1=
3+9=12