1.4 Lösning 5b
Från Mathonline
\( {2 \over x} + {3 \over x^2} + {4 \over x^3} \; = \; {2\,\cdot\,x^2 \over x\,\cdot\,x^2} + {3\,\cdot\,x \over x^2\,\cdot\,x} + {4\,\over\,x^3} \; = \; {2\,x^2 \over x^3} + {3\,x \over x^3} + {4 \over x^3} \; = \; \)
\( = {2\,x^2\,+\,3\,x\,+\,4 \over x^3} \)
