Tīpoka ki ngā ihirangi matua
Whakaoti mō F
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Whakaoti mō r
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

30F=20\left(r+30\right)
Whakareatia ngā taha e rua o te whārite ki te r+30.
30F=20r+600
Whakamahia te āhuatanga tohatoha hei whakarea te 20 ki te r+30.
\frac{30F}{30}=\frac{20r+600}{30}
Whakawehea ngā taha e rua ki te 30.
F=\frac{20r+600}{30}
Mā te whakawehe ki te 30 ka wetekia te whakareanga ki te 30.
F=\frac{2r}{3}+20
Whakawehe 600+20r ki te 30.
30F=20\left(r+30\right)
Tē taea kia ōrite te tāupe r ki -30 nā te kore tautuhi i te whakawehenga mā te kore. Whakareatia ngā taha e rua o te whārite ki te r+30.
30F=20r+600
Whakamahia te āhuatanga tohatoha hei whakarea te 20 ki te r+30.
20r+600=30F
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
20r=30F-600
Tangohia te 600 mai i ngā taha e rua.
\frac{20r}{20}=\frac{30F-600}{20}
Whakawehea ngā taha e rua ki te 20.
r=\frac{30F-600}{20}
Mā te whakawehe ki te 20 ka wetekia te whakareanga ki te 20.
r=\frac{3F}{2}-30
Whakawehe -600+30F ki te 20.
r=\frac{3F}{2}-30\text{, }r\neq -30
Tē taea kia ōrite te tāupe r ki -30.