Question

1) calcule o valor numerico das expressão 1)a^2b-ab^2 p/a=-1 b=2. 2)3x^2/4+2y/3 p/ x=2 e y=6. 3)√3x+4-3x^2/8 p/x=4. 4)x^2-5x+6 p/x=-1. 5)2x^2-3x+2/4 p/x=-2. 6)abcd/2 p/a=b=c=d=1/2

Answer 1

1) a = -1 ,  b = 2
$a ^{2b} - ab ^{2}$
$( -1)^{2.2} - (-1).2 ^{2}$
$(-1)^{4} + 1. 4$
1 + 4 = 5

2) x = 2 e y = 6
3x² /4 + 2y/ 3
3.2² / 4 + 2.6 / 3
3.4 / 4 + 12 / 3
3 + 4 = 7

3) x = 4
(√3x +4 - 3x²) / 8
(4√3 + 4 - 3.4²) / 8
(4√3 + 4 -  3.16) / 8
(4√3 + 4 - 48) / 8
(√3 - 11) / 2

4) x = -1
x² - 5x + 6
(-1)² - 5.(-1) + 6
1 + 5 + 6 = 12

5) x = -2
$\frac{2 x^{2}-3x + 2 }{4}$
$\frac{2 .(-2)^{2}-3.(-2)+2 }{4}$
$\frac{2.4+6+2}{4}$
$\frac{16}{4} = 4$

6) a=b=c=d = 1/2
$\frac{a.b.c.d}{2}$
$\frac{(1/2).(1/2).(1/2).(1/2)}{2}$
$\frac{1/16}{2} = \frac{1}{32}$