Resposta:
[(64 – 16·4) + (48·10 – 180)]·5
[(64 - 64) + (480 - 180)] . 5
[0 + 300] . 5
300 . 5
1500
um quinto de 1500
1/5 . 1500
1500/5
b)300
2.
[-(-2)³ - 2³]
[2³ - 2³]
[8 - 8]
a)0
3.
[2 + 3 . 4] ÷ 7 + 7
[2 + 12] ÷ 7 + 7
14 ÷ 7 + 7
2 + 7
a)9
4.
a) x² - 5x + 6 = 0
x' + x" = 5
x' . x" = 6
x' = 2
x' = 2x" = 3
b) x² - 2x + 1 = 0
x' + x" = 2
x' + x" = 1
x' = 1
x" = 1
c) x² + 6x + 5 = 0
x' + x" = -6
x' . x" = 5
x' = -1
x' = -1x" = -5
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Resposta:
[(64 – 16·4) + (48·10 – 180)]·5
[(64 - 64) + (480 - 180)] . 5
[0 + 300] . 5
300 . 5
1500
um quinto de 1500
1/5 . 1500
1500/5
b)300
2.
[-(-2)³ - 2³]
[2³ - 2³]
[8 - 8]
a)0
3.
[2 + 3 . 4] ÷ 7 + 7
[2 + 12] ÷ 7 + 7
14 ÷ 7 + 7
2 + 7
a)9
4.
a) x² - 5x + 6 = 0
x' + x" = 5
x' . x" = 6
x' = 2
x' = 2x" = 3
b) x² - 2x + 1 = 0
x' + x" = 2
x' + x" = 1
x' = 1
x" = 1
c) x² + 6x + 5 = 0
x' + x" = -6
x' . x" = 5
x' = -1
x' = -1x" = -5
x' = -1x" = -5