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[12+3-11+3+(18+7-5+3-9) :7]+10-2-8​

Răspuns :

[12+3-11+3+(18+7-5+3-9):7]+10-2-8=

=[15-11+3+(25-5+3-9):7]+8-8=

=[4+3+(20+3-9):7]+0=

=[7+(23-9):7]=

=(7+14:7)=

=(7+2)=

=9

Răspuns:

[12+3-11+3+(18+7-5+3-9):7]+10-2-8=9

[12+3-11+3+(25-5+3-9):7]+10-2-8

[12+3-11+3+(20+3-9):7]+10-2-8

[12+3-11+3+(23-9):7]+10-2-8

(12+3-11+3+14:7)+10-2-8

(12+3-11+3+2)+10-2-8

(15-11+3+2)+10-2-8

(4+3+2)+10-2-8

(7+2)+10-2-8

9+10-2-8

19-2-8

17-8

9