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10+10:(10•10-10•9)•10-2:(10-8)

Răspuns :

10+10:(100-90)·10-2:2=
10+10:10·10-1=
10+1·10-1=
10+10-1=
20-1=
19
10+10:(100-90)•8:2=
20:20•4=
10•4=40.

RĂSPUNS:40