Question

Выполните действие(с пояснениями! ): 1/4 + 2/5 2/3 + 1/4 3/4 + 2/5 1/8 + 1/4 1/8 + 7/12 заранее !

Answer 1

$\frac{1}{4} + \frac{2}{5} = \frac{(1*5)+(2*4)}{4*5} = \frac{5+8}{20} = \frac{13}{20}$
$\frac{2}{3} + \frac{1}{4} = \frac{(2*4)+(1*3)}{3*4} = \frac{11}{12}$
$\frac{3}{4} + \frac{2}{5} = \frac{(3*5)+(2*4)}{4*5} = \frac{15+8}{20} = \frac{23}{20} =1 \frac{3}{20}$
$\frac{1}{8} + \frac{1}{4} = \frac{4+8}{4*8} = \frac{12}{32} = \frac{3}{8}$
$\frac{1}{8} + \frac{7}{12} = \frac{(1*12)+(7*8)}{8*12} = \frac{68}{96} = \frac{17}{24}$