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HELPPP!!!!!! help!!!!!!

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Răspuns :

5/6+1/9=(5*3+1*2)/18=17/18
2/3-1/4=(2*4-1*3)/12=5/12
-5/12-3/16=-(5*4+3)/48=-23/48
-3/10-4/15=-(3*3+4*2)/30=-17/30