User:Egil530/matematikk

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$Barn \; x\,$
$Voksne \; y\,$

$5x + 7y \,$	$= 5 \,$
$4x + 4y \,$	$= 3,2 \,$

$\frac{5x}{5} \,$	$= \frac{5}{5} - \frac{7y}{5} \,$
$x \,$	$= 1 - 1,4y \,$
$4(1-1,4y)+4y \,$	$= 3,2 \,$
$4 - 5,6y + 4y \,$	$= 3,2 \,$
$4 - 3,2 \,$	$= 5,6y - 4y \,$
$\frac{0,8}{1,6} \,$	$= \frac{1,6y}{1,6} \,$
$y \,$	$= 0,5 \,$

$x \,$	$= 1 - 1,4y \,$
$x \,$	$= 1 - 1,4 \times 0,5 \,$
$x \,$	$= 1 - 0,7 \,$
$x \,$	$= 0,3 \,$

$3 \times 0,3\,$	$= 0,9 \; kg \,$
$10 \times 0,5\,$	$= 5 \; kg \,$
$0,9 + 5\,$	$= 5,9 \; kg \,$

slutt

$y_3 = 16433,42 \approx 16433,50 \; kr$

$\begin{vmatrix} \times 4 \end{vmatrix}$

$13! = 6227020800 \,$

$13! = 6.227.020.800 \,$

$6,98 \; $/ounce\,$	$=6,98 \times 6,43 \; kr /28,349 \; g \,$
$\frac{44,8814 \; kr}{28,35}/\frac{28,35 \; g}{28,35}\,$	$=1,583 \; kr / g \,$

$35+39+33 = 107 \; g\,$ $107 \times 0,830= 88,81 \; g \,$ $88,81 \times 13= 1154,53 \; g \,$ $1154,53 \times 1,583= 1827,62 \; kr \approx 1827,50 \; kr \,$

Brukes senere:

$35 \; g \ times 1,583 \; kr/g\,$	$= \,$
$\frac{44,8814 \; kr}{28,35}/\frac{28,35 \; g}{28,35}\,$	$=1,583 \; kr / g \,$

$\frac{(x-100)+x+(x-100) \times 2+2x}{4}\,$	$=825\,$
$(x-100)+x+(x-100) \times 2+2x \,$	$= 3300 \,$
$x-100+x+2x-200+2x \,$	$= 3300 \,$
$x+x+2x+2x \,$	$= 3300+100+200 \,$
$\frac{6x}{6} \,$	$= \frac{3600}{6} \,$
$x \,$	$= 600 \,$

$2,5:10\,$	$=0,25 \; l \; saft\,$
$0,25 \times 9 \,$	$= 2,25 \; l \; vann \,$
$2,25 : 5 \,$	$= 0,45\,$
$0,45 - 0,25\,$	$= 0,2 \; l \; saft\,$

$4 \times \pi \times \ 5^2 \,$	$=314,159 \; cm^2\,$
$s \,$	$= \sqrt{5^2+5^2} = 7,071 \,$
$\pi (5 \times 5 + 5 \times 7,071) \,$	$= \pi (25+35,355) = 189,61 \; cm^2\,$

$314,159 \; cm^2 + 189,61 \; cm^2 \,$	$=503,769 \; cm^2\,$
$503,769 \; cm^2 \times 20 \,$	$= 10075,38 \; cm^2 \approx 1 \; m^2\,$

$A = \pi r(r+s) \,$

$A = \pi r (r+ \sqrt{r^2 + h^2})$

$Y_n = Y_0\left (1+ \frac{p}{100} \right )^n$

$\frac{\pi \times 5^2 \times 5}{3} \,$	$\approx 130,9 \; cm^3\,$
$\frac{4 \times \pi \times 5^3}{3} \,$	$\approx 523,6 \; cm^3 \,$
$130,9 \; cm^3 + 523,6 \; cm^3 \,$	$=654,5 \; cm^3 = 0,6545 \; dm^3\,$
$0,6545 \; dm^3 \times 3,1 \; kg/dm^3\,$	$=2,02895 \; kg\,$
$2,02895 \; kg \times 20 \,$	$=40,57 \; kg \approx 40,5 \; kg\,$

$(2x)^2 \,$	$=x^2+6^2 \,$
$(2x)^2-x^2 \,$	$=6^2 \,$
$4+4x+x^2-x^2 \,$	$=6^2 \,$
$4+4x \,$	$=36 \,$
$4x \,$	$=36-4 \,$
$\frac{4x}{4} \,$	$= \frac{32}{4} \,$
$x \,$	$=8 \,$

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User:Egil530/matematikk

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