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Va rog ajutati-ma si pe mine
10+10:{[10+10x(a-10)]:10-10}=11


Răspuns :

10+10÷{[10+10×(a-10)]÷10-10}=11<=> [10+10×(a-10)]÷10-10=(11-10)×10 <=> [10+10×(a-20)]÷10=20<=> 10×(a-10)=20×10-10<=>a- 10=190÷10=>a=19+10=29.