Whakaoti i te 2/5-11/4+4.5+25%

$$\frac { 2 } { 5 } - 1 \frac { 1 } { 4 } + 4.5 + 25 \%$$

Aromātai

$$3.9$$

Ngā Upane Otinga

Whakareatia te 1 ki te 4, ka 4.

$$\frac{2}{5}-\frac{4+1}{4}+4.5+\frac{25}{100}$$

Tāpirihia te 4 ki te 1, ka 5.

$$\frac{2}{5}-\frac{5}{4}+4.5+\frac{25}{100}$$

Ko te maha noa iti rawa atu o 5 me 4 ko 20. Me tahuri \frac{2}{5} me \frac{5}{4} ki te hautau me te tautūnga 20.

$$\frac{8}{20}-\frac{25}{20}+4.5+\frac{25}{100}$$

Tā te mea he rite te tauraro o \frac{8}{20} me \frac{25}{20}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{8-25}{20}+4.5+\frac{25}{100}$$

Tangohia te 25 i te 8, ka -17.

$$-\frac{17}{20}+4.5+\frac{25}{100}$$

Me tahuri ki tau ā-ira 4.5 ki te hautau \frac{45}{10}. Whakahekea te hautanga \frac{45}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 5.

$$-\frac{17}{20}+\frac{9}{2}+\frac{25}{100}$$

Ko te maha noa iti rawa atu o 20 me 2 ko 20. Me tahuri -\frac{17}{20} me \frac{9}{2} ki te hautau me te tautūnga 20.

$$-\frac{17}{20}+\frac{90}{20}+\frac{25}{100}$$

Tā te mea he rite te tauraro o -\frac{17}{20} me \frac{90}{20}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$\frac{-17+90}{20}+\frac{25}{100}$$

Tāpirihia te -17 ki te 90, ka 73.

$$\frac{73}{20}+\frac{25}{100}$$

Whakahekea te hautanga \frac{25}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 25.

$$\frac{73}{20}+\frac{1}{4}$$

Ko te maha noa iti rawa atu o 20 me 4 ko 20. Me tahuri \frac{73}{20} me \frac{1}{4} ki te hautau me te tautūnga 20.

$$\frac{73}{20}+\frac{5}{20}$$

Tā te mea he rite te tauraro o \frac{73}{20} me \frac{5}{20}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$\frac{73+5}{20}$$

Tāpirihia te 73 ki te 5, ka 78.

$$\frac{78}{20}$$

Whakahekea te hautanga \frac{78}{20} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{39}{10}$$

Tauwehe

$$\frac{3 \cdot 13}{2 \cdot 5} = 3\frac{9}{10} = 3.9$$