Question

Efectuati:
a). (4supra7-1supra28)+(9supra28+1supra7)

Answer 1

$\frac{4}{7}(amplificam cu 4) - \frac{1}{28} = \frac{16}{28}- \frac{1}{28} = \frac{15}{28}$

$\frac{9}{28} + \frac{1}{7} (amplificam cu 4)= \frac{9}{28}+ \frac{4}{28}= \frac{13}{28}$

$\frac{15}{28} + \frac{13}{28} = \frac{28}{28} =1$