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help la ex 19 dau funda dar sa fie si corecte

Help La Ex 19 Dau Funda Dar Sa Fie Si Corecte class=

Răspuns :

a)(1/7+6/7)+(7/11+4/11)+(2010/2011+2010/2011)=7/7+11/11+0=1+1+0=2
b)(5/3-2/3)+(7/5-2/5)+(9/7-2/7)=3/3+5/5+7/7=1+1+1=3