Whakaoti i te 3/5+(-7/8)-13/20

$$\frac { 3 } { 5 } + ( - \frac { 7 } { 8 } ) - \frac { 13 } { 20 }$$

Aromātai

$$-\frac{37}{40}=-0.925$$

Ngā Upane Otinga

Ko te maha noa iti rawa atu o 5 me 8 ko 40. Me tahuri \frac{3}{5} me \frac{7}{8} ki te hautau me te tautūnga 40.

$$\frac{24}{40}-\frac{35}{40}-\frac{13}{20}$$

Tā te mea he rite te tauraro o \frac{24}{40} me \frac{35}{40}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{24-35}{40}-\frac{13}{20}$$

Tangohia te 35 i te 24, ka -11.

$$-\frac{11}{40}-\frac{13}{20}$$

Ko te maha noa iti rawa atu o 40 me 20 ko 40. Me tahuri -\frac{11}{40} me \frac{13}{20} ki te hautau me te tautūnga 40.

$$-\frac{11}{40}-\frac{26}{40}$$

Tā te mea he rite te tauraro o -\frac{11}{40} me \frac{26}{40}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{-11-26}{40}$$

Tangohia te 26 i te -11, ka -37.

$$-\frac{37}{40}$$

Tauwehe

$$-\frac{37}{40} = -0.925$$