Bokstavregning

$$=4a+4b$$

$$=-4x+4y-17a+7$$

$$=11d-3ab$$

$$=5x^2+2x+4$$

$$=3a$$

$$=5-2ab-3bc+3ab-4bc=ab-7bc+5$$

$$\begin{array}{rcl}& = & 2b+3b-12\\ & & \\ & =& 5b-12\end{array}$$

$$\begin{array}{rcl}& = & \left(7x-28\right)+\left(2x+6\right)\\ & & \\ & =& 7x-28+2x+6\\ & & \\ & =& 9x-22\end{array}$$

$$\begin{array}{rcl}& = & 5a-\left(-6a-12\right)+(5a-5\\ & & \\ & =& 5a+6a+12+5a-5\\ & & \\ & =& 16a+7\end{array}$$

$$\begin{array}{rcl}& = & \left(6ab+3b^2\right)-\left(4a^2-4a\right)-\left(2b^2-2a\right)\\ & & \\ & =& 6ab+3b^2-4a^2+4a-2b^2+2a\\ & & \\ & =& -4a^2+6a+6ab+b^2\end{array}$$

$$\begin{array}{rcl}& = & 5x-\left(3x+3\right)-\left(5x-x^2+10-2x\right)\\ & & \\ & =& 5x-3x-3-5x+x^2-10+2x\\ & & \\ & =& x^2-x-13\end{array}$$

$$\begin{array}{rcl}& = & \left(3a-ab+6-2b\right)-\left(3a-ab\right)\\ & & \\ & =& 3a-ab+6-2b-3a+ab\\ & & \\ & =& -2b+6\end{array}$$

$$\begin{array}{rcl}& = & {\left(-3\right)}^2-2^2-\left(-3-2\right)\\ & & \\ & =& 9-4+3+2\\ & & \\ & =& 10\end{array}$$

$$\begin{array}{rcl}& = & 2·{\left(-3\right)}^2-3·\left(-3\right)-3·\left(-3\right)·2+2\\ & & \\ & =& 2·9+9+18+2\\ & & \\ & =& 47\end{array}$$

$$\begin{array}{rcl}& = & -{\left(-3\right)}^2+3·\left(-3\right)-2^2\\ & & \\ & =& -9-9-4\\ & & \\ & =& -22\end{array}$$