9.3.1 Að leysa jöfnur með brotum

Upphitun

Leystu hverja jöfnu í huganum.

1. $$x+x=\frac{1}{4}$$
   Lausn

   $$x=\frac{1}{8}$$
2. $${\left(\frac{3}{2}\right)}^2=x$$
   Lausn

   $$x=\frac{9}{4}$$
3. $$\frac{3}{5}+x=\frac{9}{5}$$
   Lausn

   $$x=\frac{6}{5}$$
4. $$\frac{1}{12}+x=\frac{1}{4}$$
   Lausn

   $$x=\frac{1}{6}$$