Question

Eu preciso muito de ajuda ! Por favor

Answer 1

Resposta:

A)

$2*2,3-0,9:2$

$2*\frac{23}{10} -\frac{9}{10} :2$

$\frac{2*23}{10} -\frac{9}{10} *\frac{1}{2}$

$\frac{46}{10} -\frac{9}{10*2}$

$\frac{46}{10} -\frac{9}{20}$

$\frac{2*46}{2*10} -\frac{9}{20}$

$\frac{92}{20} -\frac{9}{20}$

$\frac{83}{20} =4,15$

B)

$(0,6)^2+3,1-4^0$

$\frac{6^2}{10^2} +\frac{31}{10} -1$

$\frac{36}{100} +\frac{310}{100} -\frac{100}{100}$

$\frac{246}{100} =2,46$

C)

$(4,2)^2:0,2-3,5$

$\frac{42^2}{10^2}:\frac{2}{10}-\frac{35}{10}$

$\frac{1764}{100} *\frac{10}{2} -\frac{35}{10}$

$\frac{3528}{200} -\frac{35}{10}$

$\frac{3528}{200} -\frac{2*10*35}{2*10*10}$

$\frac{3528-700}{200}$

$\frac{2828}{200}$$=14,14$