User:Egil530/matematikk

$Barnx$
$Voksney$

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

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

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

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

slutt

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

$\left|\begin{array}{c}\times 4\end{array}\right|$

$13!=6227020800$

$13!=6.227.020.800$

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

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

Brukes senere:

$35gtimes1,583kr/g$	$=$
$\frac{44,8814kr}{28,35}/\frac{28,35g}{28,35}$	$=1,583kr/g$

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

$2,5:10$	$=0,25lsaft$
$0,25\times 9$	$=2,25lvann$
$2,25:5$	$=0,45$
$0,45-0,25$	$=0,2lsaft$

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

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

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

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

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

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

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

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