Question

calcule o dobro de 1\5,1\2,2 1\2, 1\4,

Answer 1

$\frac{1}{5} *2= \frac{2}{5} \\\\ \frac{1}{2} *2=1\\\\2 \frac{1}{2} *2= \frac{5}{2}*2 = \frac{10}{2} \\\\ \frac{1}{4} *2= \frac{2}{4} =\frac{1}{2}$

Answer 2

$\frac{1}{5} * 2 = \frac{2}{5}= 0,4 \\ \\ \frac{1}{2}*2=1 \\ \\ 2 \frac{1}{2}*2 = \frac{4+1}{2}*2= \frac{10}{2} =5 \\ \\ \frac{1}{4} *2 = \frac{2}{4}= \frac{1}{2}=0,5$