Odpowiedź:
z.8
[tex]\frac{4}{x} = \frac{12}{6} = 2[/tex]
więc x = 2
----------------------
[tex]\frac{8}{y} = \frac{12}{6} = 2[/tex]
więc
y = 4
-----------
P = 0,5*( 2 + 6)*4 = 16 j²
======================
z.9
[tex]\frac{3 x - 2}{x} = \frac{( 3 x - 2) + ( 2 x + 2)}{2 x + 1}[/tex] x > 0
[tex]\frac{3x - 2}{x} = \frac{5 x}{2 x + 1}[/tex] Mnożymy na krzyż
(3 x - 2)*( 2 x + 1) = x*5 x
6 x² + 3 x - 4 x - 2 = 5 x²
x² - x - 2 = 0
( x + 1)*(x - 2) = 0
x + 1 = 0 lub x - 2 = 0
x = - 1 < 0 x = 2
Odp. x = 2
=================
Szczegółowe wyjaśnienie:
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Odpowiedź:
z.8
[tex]\frac{4}{x} = \frac{12}{6} = 2[/tex]
więc x = 2
----------------------
[tex]\frac{8}{y} = \frac{12}{6} = 2[/tex]
więc
y = 4
-----------
P = 0,5*( 2 + 6)*4 = 16 j²
======================
z.9
[tex]\frac{3 x - 2}{x} = \frac{( 3 x - 2) + ( 2 x + 2)}{2 x + 1}[/tex] x > 0
[tex]\frac{3x - 2}{x} = \frac{5 x}{2 x + 1}[/tex] Mnożymy na krzyż
(3 x - 2)*( 2 x + 1) = x*5 x
6 x² + 3 x - 4 x - 2 = 5 x²
x² - x - 2 = 0
( x + 1)*(x - 2) = 0
x + 1 = 0 lub x - 2 = 0
x = - 1 < 0 x = 2
Odp. x = 2
=================
Szczegółowe wyjaśnienie: