Whakaoti i te 15*65-15*45div2

$$15 \times 65-15 \times 45 \div 2$$

Aromātai

$$\frac{1275}{2}=637.5$$

Ngā Upane Otinga

Whakareatia te 15 ki te 65, ka 975.

$$975-\frac{15\times 45}{2}$$

Whakareatia te 15 ki te 45, ka 675.

$$975-\frac{675}{2}$$

Me tahuri te 975 ki te hautau \frac{1950}{2}.

$$\frac{1950}{2}-\frac{675}{2}$$

Tā te mea he rite te tauraro o \frac{1950}{2} me \frac{675}{2}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{1950-675}{2}$$

Tangohia te 675 i te 1950, ka 1275.

$$\frac{1275}{2}$$

Tauwehe

$$\frac{3 \cdot 5 ^ {2} \cdot 17}{2} = 637\frac{1}{2} = 637.5$$