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-4/15 - 3/10 +2/3 =?

Răspuns :

-4/(3x5)-3/(2x5)+2/3 = -4/3x1/5-3/2x1/5+2/3 = 1/5(-4/3-3/2)+2/3 = 1/5(-8/6-9/6)+2/3 = 1/5(-17/6)+2/3 = -17/30+2/3 = -17/30+20/30 = 3/30 = 1/10
-4/15-3/10+2/3=aducem la acelasi numitor ,si numitorul comun este 30 , -8/30-9/30+20/30= 3/10=0,3