Question

Rezolvati va rog frumos... Cazul B)

Answer 1

Răspuns:

b)

$2 \frac{2}{5} .2 \frac{1}{4 } - 6 \frac{2}{9} . \frac{3}{8} =$

$= \frac{2 \times 5 + 2}{5} \times \frac{2 \times 4 + 1}{4} - \frac{6 \times 9 + 2}{9} \times \frac{3}{8}$

$= \frac{12}{5} \times \frac{9}{4} - \frac{56}{9} \times \frac{3}{8}$

$= \frac{27}{5} - \frac{21}{3}$

$= \frac{81}{15} - \frac{105}{15}$

$= \frac{ - 24}{15}$

c)

$( 6 \frac{2}{5} \times 2 \frac{11}{12} - 16) \times 2 \frac{1}{4 } =$

$= ( \frac{6 \times 5 + 2}{5} \times \frac{2 \times 12 + 11}{12} - 16) \times \frac{2 \times 4 + 4}{4}$

$= ( \frac{32}{5} \times \frac{35}{12} - 16) \times \frac{9}{4}$

$= (112 supra 6 - 16) \times \frac{9}{4}$

$= (112 supra 6-96 supra 6) \times \frac{9}{4}$

$= 16 supra 6× \frac{9}{4}$

=36 supra 6

=6

Sper te-am ajutat.