Whakaoti i te =22000/(1+r)^2-18000

$$= \frac { 22000 } { ( 1 + r ) ^ { 2 } } - 18000$$

Aromātai

$$\frac{2000\left(2-18r-9r^{2}\right)}{\left(r+1\right)^{2}}$$

Ngā Hipanga Rongoā Poto

Hei tāpiri, hei tango kīanga rānei, me whakaroha ērā kia rite ā rātou tauraro. Whakareatia 18000 ki te \frac{\left(1+r\right)^{2}}{\left(1+r\right)^{2}}.

$$\frac{22000}{\left(1+r\right)^{2}}-\frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Tā te mea he rite te tauraro o \frac{22000}{\left(1+r\right)^{2}} me \frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{22000-18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Mahia ngā whakarea i roto o 22000-18000\left(1+r\right)^{2}.

$$\frac{22000-18000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Whakakotahitia ngā kupu rite i 22000-18000-36000r-18000r^{2}.

$$\frac{4000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Whakarohaina te \left(1+r\right)^{2}.

$$\frac{4000-36000r-18000r^{2}}{r^{2}+2r+1}$$

Whakaroha

$$-\frac{2000\left(9r^{2}+18r-2\right)}{\left(r+1\right)^{2}}$$

Ngā Hipanga Rongoā Poto

Hei tāpiri, hei tango kīanga rānei, me whakaroha ērā kia rite ā rātou tauraro. Whakareatia 18000 ki te \frac{\left(1+r\right)^{2}}{\left(1+r\right)^{2}}.

$$\frac{22000}{\left(1+r\right)^{2}}-\frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Tā te mea he rite te tauraro o \frac{22000}{\left(1+r\right)^{2}} me \frac{18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{22000-18000\left(1+r\right)^{2}}{\left(1+r\right)^{2}}$$

Mahia ngā whakarea i roto o 22000-18000\left(1+r\right)^{2}.

$$\frac{22000-18000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Whakakotahitia ngā kupu rite i 22000-18000-36000r-18000r^{2}.

$$\frac{4000-36000r-18000r^{2}}{\left(1+r\right)^{2}}$$

Whakarohaina te \left(1+r\right)^{2}.

$$\frac{4000-36000r-18000r^{2}}{r^{2}+2r+1}$$