Question

4 supra 25 - 64 supra 9

Answer 1

$\frac{4}{25} - \frac{64}{9} = \frac{4 \times 9}{25 \times 9} - \frac{64 \times 25}{9 \times 25} = \frac{36}{225} - \frac{1600}{225} = \frac{36 - 1600}{225} = - \frac{1564}{225} = - 6 \frac{214}{225}$

Answer 2

4/25  - 64/9 =  ( dam factor comun 225)

(4 x 9) /225  - (64 x 25) / 225 =

36/225  - 1600/225 =

(36 - 1600) / 225 =

-1564 / 225 =

- 6,95(1)