Question

calcule o valor das expressões :
a-(10√27+10√3)÷10√3
b-√2 (√2+2)
c-(5+√7)×(2-√7)

Answer 1

Olá,

a)

(10√27+10√3)÷10√3 =
(10√27÷10√3) + (10√3÷10√3) =
(√27÷√3) + 1 =
√(27/3) + 1 =
√9 + 1 = 
3 + 1 =
4

Resposta:

4

b)

√2×(√2+2) = 
(√2×√2) + 2√2 = 
√(2×2) + 2√2 = 
√4 + 2√2 = 
2 + 2√2 

Resposta:

2 + 2√2 

c)

(5+√7)×(2-√7) = 
10-5√7+2√7-√(7×7) = 
10-5√7+2√7-√49 = 
10-5√7+2√7-7 =
10-7-5√7+2√7 =
3-3√7 

Resposta:

3 - 3√7