Whakaoti i te y=21/5*31/4

$$y = 2 \frac { 1 } { 5 } \times 3 \frac { 1 } { 4 }$$

Whakaoti mō y

$$y = \frac{143}{20} = 7\frac{3}{20} = 7.15$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakareatia te 2 ki te 5, ka 10.

$$y=\frac{10+1}{5}\times \frac{3\times 4+1}{4}$$

Tāpirihia te 10 ki te 1, ka 11.

$$y=\frac{11}{5}\times \frac{3\times 4+1}{4}$$

Whakareatia te 3 ki te 4, ka 12.

$$y=\frac{11}{5}\times \frac{12+1}{4}$$

Tāpirihia te 12 ki te 1, ka 13.

$$y=\frac{11}{5}\times \frac{13}{4}$$

Me whakarea te \frac{11}{5} ki te \frac{13}{4} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$y=\frac{11\times 13}{5\times 4}$$

Mahia ngā whakarea i roto i te hautanga \frac{11\times 13}{5\times 4}.

$$y=\frac{143}{20}$$

Tautapa y

$$y≔\frac{143}{20}$$