Pré-Vestibular ⇒ (UFF - 2015 - 2° Semestre) Matemática Básica

[edinaldoprof]

Eferue:
a) 2+5×0−2−[−3−(−1)]
b) [tex3](-3)^{2}[/tex3] +27−27÷3
c) [tex3](\frac{1}{5})^{-2}[/tex3]−25÷5+5×[tex3](2)^{2}[/tex3]

[Rafa2604]

Efetue:
a) [tex3]2+5×0−2−[−3−(−1)][/tex3]
[tex3]2+(5×0)−2−[−3−(−1)] = 2 + 0 -2 - [-3 +1] = 2 + 0 -2 - [-2] = 2 + 0 -2 +2 = 2[/tex3]


b) [tex3](-3)^{2} +27−27÷3[/tex3]
[tex3](-3)^{2} +27−(27÷3) = 9 + 27 - 9 = 27[/tex3]

c) [tex3](\frac{1}{5})^{-2}−25÷5+5×(2)^{2}[/tex3]
[tex3](\frac{1}{5})^{-2}−(25÷5)+[5×(2)^{2}] = 5^2 - (25 ÷ 5) + [5 \times 4] = 25 - 5 + 20 = 40[/tex3]