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Răspuns :

ex.6 (x+2)²/(x-2)(x+2)=(x+2)/(x-2)

ex.7

3,8(3)=(383-38)/90=345/90

2,(54)=(254-2)/99=252/99

2,(3)=(23-2)/9=21/9

(345/90-252*11/99*27)*9/21=1/9(345/10-252/28)*9/21=17/14