ajutati ma si pe mn la tot testul de evaluare
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Răspuns:
1.
1/5-(3/20-1/12)-(5/6-49/60)=
1/5-(9/60-5/60)-(50/60-49/60)
1/5-4/60-1/60=12/60-4/60-1/60=7/60
2. 3/98,3/61,8/25,3/14
3. 1212/1313-1313/1717=1212/1717
4. 11011/12012-12012/17017=11011/17017