Question

Me ajudem por favor!

Answer 1

1. a)

$5 - (-4) = \\5+4 = 9$

b)

$3*(2)+6=\\6+6=12$

c)

$2*(-1)+(-3)=\\-2-3 = -5$

d)

$3-2*(-5)=\\3+10 = 13$

e)

$\frac{1}{2} +(-\frac{1}{5})=\\\\ \frac{1}{2} - \frac{1}{5} =$

$0,5 - 0,2 = 0,3$

f)

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

$3 + 0,5 = 3,5$

2. a)

$(-2)^{2} - 5*(-2)=\\+4 + 10 = 14$

b)

$(-3)^{2} -2*(5)\\+9-10=-1$

c)

$3(-2)^{2} -(-7)^{2} =\\3(+4)-(+49)=\\12-49=-37$

d)

$5(-3)^{2} +3(-3)(4)=\\5(+9) -9(4)=\\45-36=9$

e)

$(\frac{2}{3})^{2} + 4*(\frac{2}{3})=\\\\ \frac{4}{9} + \frac{8}{3} = (mmc)\\ \\\frac{4+24}{9} =\\\\\frac{28}{9} = 3,11$

Espero ter ajudado, bons estudos! :)