Question

calcule o valor numérico:

a)
$- 2y {}^{2} + y - 3 \: para \: y = 11$

b)
$4a - 2 - 6 \: a {}^{3} + 5 \: a \: para \: a = 3$

c)
$x {}^{2} .(2x {}^{2} - 3) + x {}^{2} para \: x = 2$

d)
$a {}^{2} b - 4 \: a \: b + 3 \: a - 5 \: a \: b {}^{2} \: para \: a = \: 2 \: e \: b = 10$

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Answer 1

Só substituir

$a) \: {( - 2 \times 11)}^{2} - 3 \\ {( - 22)}^{2} - 3 \\ 484 - 3 \\ 481$

$b) \: 4 \times 3 - 2 - ( {6 \times 3)}^{3} \\ 12 - 2 - {18}^{3} \\ 12 - 2 - 5832 \\ - 5822$

$c) \: {2}^{2} \times {(( {2 \times 2})^{2} - 3) }^{2} + {2}^{2} \\ {2}^{2} \times ( {4}^{2} - 3) + {2}^{2} \\ {2}^{2} \times (16 - 3) + {2}^{2} \\ {2}^{2} + 13 + {2}^{2} \\ 13 \times {2}^{2} + {2}^{2}$

$14 \times {2}^{2} \\ 14 \times 4 \\ 56$

$d) \: {2}^{2} \times 10 - 4 \times 2 \times 10 + 3 \times 2 - 5 \times 2 \times {10}^{2}$

$2(2 \times 10 - 4 \times 10 - 3 - 5 \times {10}^{2} )$

$2(20 - 40 + 3 - 5 \times 100)$

$2(20 - 40 + 3 - 500)$

$2 \times ( - 517)$

$- 1034$