Question

Resolva as expressão abaixo A) (2,65-4):9= B) 5.(3x4,1-7/2)= C)1/3.2/3:1/7= D)16.(-1/4-20.(-0.6)+25= AJUDEM PFV

Answer 1

$A)\ \dfrac{2,65-4}{9}\\\\ =\dfrac{-1,35}{9}\\\\ =\dfrac{-135}{900}\\\\ =\dfrac{-45}{300}\\\\ =\dfrac{-15}{100}\\\\ \boxed{=\dfrac{-3}{20}}$

$B)\ 5\times(3\times\frac{(4,1-7)}{2})\\\\ =5\times(3\times\frac{-2,9}{2})\\\\ =5\times\frac{3\times(-2,9)}{2}\\\\ =5\times\frac{-8,7}{2}\\\\ =\frac{5\times-8,7}{2}\\\\ \boxed{=\frac{-43,5}{2}}$

$C)\ \left(\dfrac{\frac{1}{3}\times\frac{2}{3}}{\frac{1}{7}}\right)\\\\ =\left(\dfrac{\frac{1\times2}{3\times3}}{\frac{1}{7}}\right)\\\\ =\left(\dfrac{\frac{2}{9}}{\frac{1}{7}}\right)\\\\ =\frac{2}{9}\times\frac{7}{1}\\\\ =\frac{2\times7}{9\times1}\\\\ \boxed{=\frac{14}{9}}$

$D)\ 16\times(\frac{-1}{4}-20\times(-0.6)+25)\\\\ =16\times(\frac{-1}{4}-(-12)+25)\\\\ =16\times(\frac{-1}{4}+12+25)\\\\ =16\times(\frac{-1}{4}+37)\\\\ =16\times(\frac{-1+(4\times37)}{4})\\\\ =16\times(\frac{-1+148}{4})\\\\ =16\times\frac{147}{4}\\\\ =\frac{16\times147}{4}\\\\ =\frac{2.352}{4}\\\\ \boxed{=588}$

Bons estudos!

Answer 2

a)(2,65-4)/9=(-1,35)_:9= -0,15
B)5.(3X4.1-7/2)= 5.(12,3-3,5) = 5.8,8=44,0

c)1/3.2/3:1/7= 1/3x14/3= 14/9
d)16.(-1/4-20.(-0,6)+25= 16.(-0,25+12)+25= 16.11,75+25=188+25=213.