Question

caucule os valores das expressões

a) 3/10 + ( 2/5 )²

b) 1 - 1/2 .√ 4/9

me ajudem porfavor dou 10 pontos

Answer 1

a)
$\frac{3}{10} +( \frac{2}{5} )^2= \\ \\ \frac{3}{10} + \frac{4}{25} = \\ \\ mmc(10,25)=50 \\ \\ \frac{15+8}{25} = \frac{23}{25}$

b)
$1- \frac{1}{2} . \sqrt{ \frac{4}{9} } = \\ \\ 1- \frac{1}{2}. \frac{2}{3} = \\ \\ 1- \frac{1}{3} = \\ \\ \frac{3-1}{3} = \frac{2}{3}$

Answer 2

a) 3/10 + ( 2/5 )² =
 = 3/10 + 4/25 =    ⇒m.m.c(10,25) = 50
     15 +  8
= -------------- =
       50

= 23/50



b) 1 - 1/2 .√ 4/9 =

 = 1 - 1/2 .2/3 =
= 1 - 2/6 =
= 1 - 1/3 =    ⇒m.m.c(1,3) = 3
     3 - 1
= ----------- =
       3

= 2/3

Espero ter ajudado, bons estudos. Abraços