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calculati b). (7/9 + 17/10 - 1/18) - (13/27 - 1/18)

Răspuns :

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(7/9 + 17/10 - 1/18) - (13/27 - 1/18) = (140/180 +306/180 -10/180) -

-( 26/54- 3/54)=  436/180- 23/ 54= 109/45- 23/54=654/270- 115/270=539/270

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