Whakaoti i te 10%*0.8+0.2*18%

$$10 \% \times 0.8 + 0.2 \times 18 \%$$

Aromātai

$$0.116$$

Ngā Upane Otinga

Whakahekea te hautanga \frac{10}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 10.

$$\frac{1}{10}\times 0.8+0.2\times \frac{18}{100}$$

Me tahuri ki tau ā-ira 0.8 ki te hautau \frac{8}{10}. Whakahekea te hautanga \frac{8}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{1}{10}\times \frac{4}{5}+0.2\times \frac{18}{100}$$

Me whakarea te \frac{1}{10} ki te \frac{4}{5} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{1\times 4}{10\times 5}+0.2\times \frac{18}{100}$$

Mahia ngā whakarea i roto i te hautanga \frac{1\times 4}{10\times 5}.

$$\frac{4}{50}+0.2\times \frac{18}{100}$$

Whakahekea te hautanga \frac{4}{50} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{2}{25}+0.2\times \frac{18}{100}$$

Whakahekea te hautanga \frac{18}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{2}{25}+0.2\times \frac{9}{50}$$

Me tahuri ki tau ā-ira 0.2 ki te hautau \frac{2}{10}. Whakahekea te hautanga \frac{2}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{2}{25}+\frac{1}{5}\times \frac{9}{50}$$

Me whakarea te \frac{1}{5} ki te \frac{9}{50} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{2}{25}+\frac{1\times 9}{5\times 50}$$

Mahia ngā whakarea i roto i te hautanga \frac{1\times 9}{5\times 50}.

$$\frac{2}{25}+\frac{9}{250}$$

Ko te maha noa iti rawa atu o 25 me 250 ko 250. Me tahuri \frac{2}{25} me \frac{9}{250} ki te hautau me te tautūnga 250.

$$\frac{20}{250}+\frac{9}{250}$$

Tā te mea he rite te tauraro o \frac{20}{250} me \frac{9}{250}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$\frac{20+9}{250}$$

Tāpirihia te 20 ki te 9, ka 29.

$$\frac{29}{250}$$

Tauwehe

$$\frac{29}{2 \cdot 5 ^ {3}} = 0.116$$