Question

Resolva as expressões numéricas:

A) - 2 . 9 + ( √49 - 3 . √1 + 4² ) - 20 ÷ 2 =

B) 3³ + ( - √49 + 2⁴ - 10° ) - 2³ =

C) (8² ÷ 2 - 5²) - 20 ÷ 2² - √4 =

Me ajudem, por favor!!!

Answer 1

Olá, Juu. (=^.^=)/

A) - 2 . 9 + ( √49 - 3 . √1 + 4² ) - 20 ÷ 2 = -8

B) 3³ + ( - √49 + 2⁴ - 10° ) - 2³ = 27

C) (8² ÷ 2 - 5²) - 20 ÷ 2² - √4 = 0

A) - 2 . 9 + ( √49 - 3 . √1 + 4² ) - 20 ÷ 2 =

-2.9+(7-3.1+16)-20:2 = 
-2.9+(7-3+16)-20:2 = 
-2.9+(23-3)-20:2 = 
-2.9+20-20:2 = 
-2.9+20-10 = 
-18+20-10 = 
-28+20 = -8

B) 3³ + ( - √49 + 2⁴ - 10° ) - 2³ =

3^3+(-7+16-1)-2^3 = 
3^3+(-8+16)-2^3 = 
3^3+8-2^3 = 
27+8-8 = 
35-8 = 27

C) (8² ÷ 2 - 5²) - 20 ÷ 2² - √4 =

(64:2-25)-20:4-2 = 
(32-25)-20:4-2 = 
7-5-2 = 
7-7 = 0

Bons estudos! :-)