Question

calcule e simplifique. a) 20-[6-4.(10-3² )+1
b) 25+{3³:9+[3² .5-3.(2³-5¹)]}

Answer 1

Oi Rafaela

a) 

20 - (6 - 4*(10 - 3²)) + 1
20 - (6 - 4*(10 - 9)) + 1
20 - (6 - 4*1) + 1
20 - (6 - 4) + 1 
20 - 2 + 1 = 19 

b)

25 + (3³/9 + (3²*5 - 3*(2³ - 5¹)))
25 + (3 + (45 - 3*(8 - 5)))
25 + (3 + (45 - 3*3))
25 + (3 + (45 - 9))
25 + (3 + 36) = 25 + 39 = 64 

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