Whakaoti i te 15-[7-(21/4+17/8)]

$$15 - [ 7 - ( 2 \frac { 1 } { 4 } + 1 \frac { 7 } { 8 } ) ]$$

Aromātai

$$\frac{97}{8}=12.125$$

Ngā Upane Otinga

Whakareatia te 2 ki te 4, ka 8.

$$15-\left(7-\left(\frac{8+1}{4}+\frac{1\times 8+7}{8}\right)\right)$$

Tāpirihia te 8 ki te 1, ka 9.

$$15-\left(7-\left(\frac{9}{4}+\frac{1\times 8+7}{8}\right)\right)$$

Whakareatia te 1 ki te 8, ka 8.

$$15-\left(7-\left(\frac{9}{4}+\frac{8+7}{8}\right)\right)$$

Tāpirihia te 8 ki te 7, ka 15.

$$15-\left(7-\left(\frac{9}{4}+\frac{15}{8}\right)\right)$$

Ko te maha noa iti rawa atu o 4 me 8 ko 8. Me tahuri \frac{9}{4} me \frac{15}{8} ki te hautau me te tautūnga 8.

$$15-\left(7-\left(\frac{18}{8}+\frac{15}{8}\right)\right)$$

Tā te mea he rite te tauraro o \frac{18}{8} me \frac{15}{8}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$15-\left(7-\frac{18+15}{8}\right)$$

Tāpirihia te 18 ki te 15, ka 33.

$$15-\left(7-\frac{33}{8}\right)$$

Me tahuri te 7 ki te hautau \frac{56}{8}.

$$15-\left(\frac{56}{8}-\frac{33}{8}\right)$$

Tā te mea he rite te tauraro o \frac{56}{8} me \frac{33}{8}, me tango rāua mā te tango i ō raua taurunga.

$$15-\frac{56-33}{8}$$

Tangohia te 33 i te 56, ka 23.

$$15-\frac{23}{8}$$

Me tahuri te 15 ki te hautau \frac{120}{8}.

$$\frac{120}{8}-\frac{23}{8}$$

Tā te mea he rite te tauraro o \frac{120}{8} me \frac{23}{8}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{120-23}{8}$$

Tangohia te 23 i te 120, ka 97.

$$\frac{97}{8}$$

Tauwehe

$$\frac{97}{2 ^ {3}} = 12\frac{1}{8} = 12.125$$