Løsning del 1 utrinn Høst 13

Oppgave 1

a)

333+ 679 = 1012

b)

859 - 378 = 481

c)

$7,4\cdot 3,6=26,64$

d)

24: 0,3 =

240 : 3 = 80

Oppgave 2

a)

78 dL = 7,8 L

b)

1,3 mil = 13 kilometer = 13 000 m

c)

2,t t = 2500 kg

d)

$12000c{m}^2=120d{m}^2=1,2m^2$

Oppgave 3

a)

$(-3+2^2)\cdot 3=(-3+4)\cdot 3=1\cdot 3=3$

b)

$$\begin{gathered} -1^2-(-6+3{)}^2= \\ -1-(-3{)}^2= \\ -1-9=10 \end{gathered}$$

Oppgave 4

a)

$\frac{1}{3}+\frac{1}{2}=\frac{2}{6}+\frac{3}{6}=\frac{2+3}{6}=\frac{5}{6}$

b)

$$\begin{gathered} \frac{9}{4}-\frac{1}{2}= \\ \frac{9}{4}-\frac{2}{4}= \\ \frac{7}{4} \end{gathered}$$

c)

$\frac{3}{2}\cdot \frac{4}{9}=\frac{3\cdot 4}{2\cdot 9}=\frac{12}{18}=\frac{2}{3}$

d)

$$\begin{gathered} 6:\frac{3}{4}= \\ \frac{6}{1}:\frac{3}{4}= \\ \frac{6}{1}\cdot \frac{4}{3} \\ \frac{24}{3}=8 \end{gathered}$$