2.1)

Regn ut og trekk sammen.

a)

$2x+x+3y$

b)

$x+2y-3x$

c)

$10a-5b+2b-3a$

d)

$z+5a-6z+2z$

e)

$2y+3x+4x-3y$

2.2)

Regn ut og trekk sammen.

a)

$\begin{array}{ccc}\hfill & x+y+2x+5x\hfill & \hfill \\ \hfill & +2y-6x+3y-5y\hfill \end{array}$

b)

$\begin{array}{ccc}\hfill & 4a-2b+a\hfill & \hfill \\ \hfill & -5b-7a+12b\hfill \end{array}$

c)

$\begin{array}{ccc}\hfill & 16a-2c+15b+8a\hfill & \hfill \\ \hfill & -7b+9c-a+21c\hfill \end{array}$

d)

$\begin{array}{ccc}\hfill & 16x+7y-5z+y\hfill & \hfill \\ \hfill & -12x-6y+4z+13x\hfill \end{array}$

2.3)

Regn ut og trekk sammen.

Du kan finne fasit her.