Whakaoti i te 20*(10+10:4)-16+(5*(5+4))=

$$20 \times ( 10 + 10 : 4 ) - 16 + ( 5 \times ( 5 + 4 ) ) =$$

Aromātai

$$279$$

Ngā Upane Otinga

Whakahekea te hautanga \frac{10}{4} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$20\left(10+\frac{5}{2}\right)-16+5\left(5+4\right)$$

Me tahuri te 10 ki te hautau \frac{20}{2}.

$$20\left(\frac{20}{2}+\frac{5}{2}\right)-16+5\left(5+4\right)$$

Tā te mea he rite te tauraro o \frac{20}{2} me \frac{5}{2}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$20\times \frac{20+5}{2}-16+5\left(5+4\right)$$

Tāpirihia te 20 ki te 5, ka 25.

$$20\times \frac{25}{2}-16+5\left(5+4\right)$$

Tuhia te 20\times \frac{25}{2} hei hautanga kotahi.

$$\frac{20\times 25}{2}-16+5\left(5+4\right)$$

Whakareatia te 20 ki te 25, ka 500.

$$\frac{500}{2}-16+5\left(5+4\right)$$

Whakawehea te 500 ki te 2, kia riro ko 250.

$$250-16+5\left(5+4\right)$$

Tangohia te 16 i te 250, ka 234.

$$234+5\left(5+4\right)$$

Tāpirihia te 5 ki te 4, ka 9.

$$234+5\times 9$$

Whakareatia te 5 ki te 9, ka 45.

$$234+45$$

Tāpirihia te 234 ki te 45, ka 279.

$$279$$

Tauwehe

$$3^{2}\times 31$$