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1 supra 2+ 2 supra 3 : 4 supra 9

Răspuns :

 

[tex]\displaystyle\\\frac{1}{2}+ \frac{2}{3}:\frac{4}{9}=~~~~~~~\text{(Facem mai intai impartirea.)}\\\\=\frac{1}{2}+ \frac{2}{3}\times\frac{9}{4}=\\\\=\frac{1}{2}+ \frac{3}{2}=\\\\=\frac{1+3}{2}=\frac{4}{2}=\boxed{\bf2}[/tex]





[tex] \frac{1}{2} + \frac{2}{3} \div \frac{4}{9} = [/tex]
[tex] \frac{1}{2} + \frac{2}{3} \times \frac{9}{4} = [/tex]
[tex] \frac{1}{2} + \frac{1}{1} \times \frac{3}{2} = [/tex]
[tex] \frac{1}{2} + \frac{3}{2} = [/tex]
[tex] \frac{4}{2} = \frac{2}{1} = 2[/tex]