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Explicație pas cu pas:

c)(1,05+0,3·2,5):1,1=(1,05+0,75)·10/11=18/10·10/11=18/11=1,(63)

a)(6,6·40/55-19/5):1/2=(6·4/5-19/5)·2=(24-19)/5·2=5/5·2=2

b si c sunt incomplete in poza

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