Whakaoti i te 2x-4/5=7/20

$$2 x - \frac { 4 } { 5 } = \frac { 7 } { 20 }$$

Whakaoti mō x

$$x=\frac{23}{40}=0.575$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Me tāpiri te \frac{4}{5} ki ngā taha e rua.

$$2x=\frac{7}{20}+\frac{4}{5}$$

Ko te maha noa iti rawa atu o 20 me 5 ko 20. Me tahuri \frac{7}{20} me \frac{4}{5} ki te hautau me te tautūnga 20.

$$2x=\frac{7}{20}+\frac{16}{20}$$

Tā te mea he rite te tauraro o \frac{7}{20} me \frac{16}{20}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$2x=\frac{7+16}{20}$$

Tāpirihia te 7 ki te 16, ka 23.

$$2x=\frac{23}{20}$$

Whakawehea ngā taha e rua ki te 2.

$$x=\frac{\frac{23}{20}}{2}$$

Tuhia te \frac{\frac{23}{20}}{2} hei hautanga kotahi.

$$x=\frac{23}{20\times 2}$$

Whakareatia te 20 ki te 2, ka 40.

$$x=\frac{23}{40}$$