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ajutor: 7supra 4 -1supra 2=

Răspuns :

[tex] \frac{7}{4} - \frac{1}{2}= \frac{7-2}{4} = \frac{5}{4} [/tex]
[tex]\frac74-^{2)}\frac12=\frac74-\frac24=\frac{7-2}4=\frac54[/tex]