Whakaoti i te r-1/2=-7/10

$$r - \frac { 1 } { 2 } = - \frac { 7 } { 10 }$$

Whakaoti mō r

$$r=-\frac{1}{5}=-0.2$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Me tāpiri te \frac{1}{2} ki ngā taha e rua.

$$r=-\frac{7}{10}+\frac{1}{2}$$

Ko te maha noa iti rawa atu o 10 me 2 ko 10. Me tahuri -\frac{7}{10} me \frac{1}{2} ki te hautau me te tautūnga 10.

$$r=-\frac{7}{10}+\frac{5}{10}$$

Tā te mea he rite te tauraro o -\frac{7}{10} me \frac{5}{10}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$r=\frac{-7+5}{10}$$

Tāpirihia te -7 ki te 5, ka -2.

$$r=\frac{-2}{10}$$

Whakahekea te hautanga \frac{-2}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$r=-\frac{1}{5}$$