Whakaoti i te 45*9-1/2*981*9

$$45 \times 9 - \frac { 1 } { 2 } \cdot 981 \cdot 9$$

Aromātai

$$-\frac{8019}{2}=-4009.5$$

Ngā Upane Otinga

Whakareatia te 45 ki te 9, ka 405.

$$405-\frac{1}{2}\times 981\times 9$$

Whakareatia te \frac{1}{2} ki te 981, ka \frac{981}{2}.

$$405-\frac{981}{2}\times 9$$

Tuhia te \frac{981}{2}\times 9 hei hautanga kotahi.

$$405-\frac{981\times 9}{2}$$

Whakareatia te 981 ki te 9, ka 8829.

$$405-\frac{8829}{2}$$

Me tahuri te 405 ki te hautau \frac{810}{2}.

$$\frac{810}{2}-\frac{8829}{2}$$

Tā te mea he rite te tauraro o \frac{810}{2} me \frac{8829}{2}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{810-8829}{2}$$

Tangohia te 8829 i te 810, ka -8019.

$$-\frac{8019}{2}$$

Tauwehe

$$-\frac{8019}{2} = -4009\frac{1}{2} = -4009.5$$