Question

Ajuda. Rápidoooooooooooooooooooo

Answer 1

Resposta:

1)

$2.1+5-2=\\2+5-2=5$

2)

$(-1)^{2}+(-2)^{2}\\(-1).(-1)+(-2).(-2)=\\+1+(+2)=\\+1+2=3$

3)

$2.\frac{1}{2}^{2}+5.\frac{1}{2}-3\\ 2.(\frac{1.1}{2.2})+\frac{5.1}{2}-3\\2.(\frac{1}{4} )+\frac{5}{2}-3\\ \frac{2.1}{4}+\frac{5}{2}-3\\\\\frac{2}{4}+\frac{5}{2}-3\\\\\\mmc=4\\\frac{4}{4} =1.2=2\\\frac{2}{2}=2.5=10 \\\\\frac{2+10}{4} -3\\\frac{12}{4}-3\\3-3=0$

4)

$2.0^{2}+3.0-5^{2}\\ 0+0-(5.5)\\0+0-25=-25$

5)

$2.(\frac{2}{3}+0)-(\frac{2}{3})^{2}+3.(\frac{2}{3})\\\\(\frac{2.2}{3})+2.0-(\frac{2.2}{3.3})+\frac{3.2}{3}\\\\\frac{4}{3}+0-\frac{4}{9}+\frac{6}{3}\\\\mmc=9\\9\3=3.4=14\\9\9=1.4=4\\9\3=3.6=18\\\\\frac{12-4=18}{9}=\frac{26}{9} ou 2,888$