Question

(2,6²-1,4²):(2,6-1,4) срочно!

Answer 1

(2,6²-1,4²):(2,6-1,4)=
$(( \frac{13}{5} )^{2} - ( \frac{7}{5} )^{2} ) \div 2 = \\ (\frac{169}{25} - \frac{49}{25} ) \div \frac{6}{5} = \frac{24}{5} \times \frac{5}{6} = 4$