Whakaoti i te phi=45*30-20*25/65*55*50*70

$$\phi = \frac{ 45 \cdot 30-20 \cdot 25 }{ 65 \cdot 55 \cdot 50 \cdot 70 }$$

Whakaoti mō ϕ

$$ϕ=\frac{17}{250250}\approx 0.000067932$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakareatia te 45 ki te 30, ka 1350.

$$ϕ=\frac{1350-20\times 25}{65\times 55\times 50\times 70}$$

Whakareatia te 20 ki te 25, ka 500.

$$ϕ=\frac{1350-500}{65\times 55\times 50\times 70}$$

Tangohia te 500 i te 1350, ka 850.

$$ϕ=\frac{850}{65\times 55\times 50\times 70}$$

Whakareatia te 65 ki te 55, ka 3575.

$$ϕ=\frac{850}{3575\times 50\times 70}$$

Whakareatia te 3575 ki te 50, ka 178750.

$$ϕ=\frac{850}{178750\times 70}$$

Whakareatia te 178750 ki te 70, ka 12512500.

$$ϕ=\frac{850}{12512500}$$

Whakahekea te hautanga \frac{850}{12512500} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 50.

$$ϕ=\frac{17}{250250}$$

Tautapa ϕ

$$ϕ≔\frac{17}{250250}$$