Whakaoti i te =4/3pi(20)^3-4/3pi(12)^3

$$= \frac { 4 } { 3 } \pi ( 20 ) ^ { 3 } - \frac { 4 } { 3 } \pi ( 12 ) ^ { 3 }$$

Aromātai

$$\frac{25088\pi }{3}\approx 26272.09216442$$

Ngā Upane Otinga

Tātaihia te 20 mā te pū o 3, kia riro ko 8000.

$$\frac{4}{3}\pi \times 8000-\frac{4}{3}\pi \times 12^{3}$$

Tuhia te \frac{4}{3}\times 8000 hei hautanga kotahi.

$$\frac{4\times 8000}{3}\pi -\frac{4}{3}\pi \times 12^{3}$$

Whakareatia te 4 ki te 8000, ka 32000.

$$\frac{32000}{3}\pi -\frac{4}{3}\pi \times 12^{3}$$

Tātaihia te 12 mā te pū o 3, kia riro ko 1728.

$$\frac{32000}{3}\pi -\frac{4}{3}\pi \times 1728$$

Tuhia te \frac{4}{3}\times 1728 hei hautanga kotahi.

$$\frac{32000}{3}\pi -\frac{4\times 1728}{3}\pi$$

Whakareatia te 4 ki te 1728, ka 6912.

$$\frac{32000}{3}\pi -\frac{6912}{3}\pi$$

Whakawehea te 6912 ki te 3, kia riro ko 2304.

$$\frac{32000}{3}\pi -2304\pi$$

Pahekotia te \frac{32000}{3}\pi me -2304\pi , ka \frac{25088}{3}\pi .

$$\frac{25088}{3}\pi$$