Question

Calcule o valor numérico de:(Imagem)

Answer 1

a
( x + y)/ ( 1 + xy)
x = 1/2
y = 1/4
( 1/2 + 1/4) / [ 1 + (1/2.1/4)]
[( 2 + 1)/4 ] / [ 1/1 + 1/8]
[ 3/4 ] / [ ( 8 + 1 )/8 ]
[ 3/4 ]/ [ 9/8]
3/4 *  8/9  =24/36 = 2/3***
2
[ 3x² - V16 ] / ( 5 - x ) 
[ 3x² - 4 ] / [ 5 - x ]
x = -2
y = 16
[3 .(-2)² - 4 ] / [5 - ( -2) ]
[ (3.4) - 4 ] / [ 5 + 2 ]
[ 12 - 4 ]  / [ 7 ]
8 / 7  *****
3
(5am) / [ a + Vm]
a - 2
m = 25
[ 5 . (-2) .( 25)] / [ (-2) + V25 ]
[ ( - 250 ) / [ ( - 2) + 5 ]
( -250) / ( + 3) =
-250/3  ***