Tīpoka ki ngā ihirangi matua
Whakaoti mō c
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Whakaoti mō d
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

r\left(2-d\right)=cy
Whakareatia ngā taha e rua o te whārite ki te y.
2r-rd=cy
Whakamahia te āhuatanga tohatoha hei whakarea te r ki te 2-d.
cy=2r-rd
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
yc=2r-dr
He hanga arowhānui tō te whārite.
\frac{yc}{y}=\frac{r\left(2-d\right)}{y}
Whakawehea ngā taha e rua ki te y.
c=\frac{r\left(2-d\right)}{y}
Mā te whakawehe ki te y ka wetekia te whakareanga ki te y.
r\left(2-d\right)=cy
Whakareatia ngā taha e rua o te whārite ki te y.
2r-rd=cy
Whakamahia te āhuatanga tohatoha hei whakarea te r ki te 2-d.
-rd=cy-2r
Tangohia te 2r mai i ngā taha e rua.
\left(-r\right)d=cy-2r
He hanga arowhānui tō te whārite.
\frac{\left(-r\right)d}{-r}=\frac{cy-2r}{-r}
Whakawehea ngā taha e rua ki te -r.
d=\frac{cy-2r}{-r}
Mā te whakawehe ki te -r ka wetekia te whakareanga ki te -r.
d=-\frac{cy}{r}+2
Whakawehe cy-2r ki te -r.