Whakaoti i te 78=1/2x(6.4+13)

$$78= \frac{ 1 }{ 2 } x(6.4+13)$$

Whakaoti mō x

$$x = \frac{780}{97} = 8\frac{4}{97} \approx 8.041237113$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Tāpirihia te 6.4 ki te 13, ka 19.4.

$$78=\frac{1}{2}x\times 19.4$$

Me tahuri ki tau ā-ira 19.4 ki te hautau \frac{194}{10}. Whakahekea te hautanga \frac{194}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$78=\frac{1}{2}x\times \frac{97}{5}$$

Me whakarea te \frac{1}{2} ki te \frac{97}{5} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$78=\frac{1\times 97}{2\times 5}x$$

Mahia ngā whakarea i roto i te hautanga \frac{1\times 97}{2\times 5}.

$$78=\frac{97}{10}x$$

Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.

$$\frac{97}{10}x=78$$

Me whakarea ngā taha e rua ki te \frac{10}{97}, te tau utu o \frac{97}{10}.

$$x=78\times \frac{10}{97}$$

Tuhia te 78\times \frac{10}{97} hei hautanga kotahi.

$$x=\frac{78\times 10}{97}$$

Whakareatia te 78 ki te 10, ka 780.

$$x=\frac{780}{97}$$