Question

Помогите пожалуйста с решением

Answer 1

$frac{7.2 - 6.1}{2.2} = frac{1.1}{2.2} = frac{1}{2} = 0.5$
$frac{21}{17.5 times 0.8} = frac{21}{14} = frac{3 times 7}{2 times 7} = frac{3}{2} = 1.5$
$frac{4}{25} + frac{15}{4} = frac{4 times 4 + 15 times 25}{25 times 4} = \ = frac{16 + 375}{100} = frac{391}{100} = 3.91$
$0.09 + 2 frac{1}{4} = 0.09 + 2.25 = 2.34$