Whakaoti i te 1-20%x=1/2

$$1 - 20 \% x = \frac { 1 } { 2 }$$

Whakaoti mō x

$$x = \frac{5}{2} = 2\frac{1}{2} = 2.5$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakahekea te hautanga \frac{20}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 20.

$$1-\frac{1}{5}x=\frac{1}{2}$$

Tangohia te 1 mai i ngā taha e rua.

$$-\frac{1}{5}x=\frac{1}{2}-1$$

Me tahuri te 1 ki te hautau \frac{2}{2}.

$$-\frac{1}{5}x=\frac{1}{2}-\frac{2}{2}$$

Tā te mea he rite te tauraro o \frac{1}{2} me \frac{2}{2}, me tango rāua mā te tango i ō raua taurunga.

$$-\frac{1}{5}x=\frac{1-2}{2}$$

Tangohia te 2 i te 1, ka -1.

$$-\frac{1}{5}x=-\frac{1}{2}$$

Me whakarea ngā taha e rua ki te -5, te tau utu o -\frac{1}{5}.

$$x=-\frac{1}{2}\left(-5\right)$$

Tuhia te -\frac{1}{2}\left(-5\right) hei hautanga kotahi.

$$x=\frac{-\left(-5\right)}{2}$$

Whakareatia te -1 ki te -5, ka 5.

$$x=\frac{5}{2}$$