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15/21-2/7-14/98+1= ? Repede vă rog!!

Răspuns :

[tex] \frac{15}{21}- \frac{2}{7} - \frac{14}{98} +1[/tex]
[tex]= \frac{5}{7} - \frac{2}{7} - \frac{1}{7} +1[/tex]
[tex]= \frac{5-2-1+7}{7} [/tex]
[tex]= \frac{9}{7} [/tex]