Whakaoti i te (3/16-0.45)*0.8-0.21:0.2

$$( \frac { 3 } { 16 } - 0.45 ) \cdot 0.8 - 0.21 : 0.2$$

Aromātai

$$-1.26$$

Ngā Upane Otinga

Me tahuri ki tau ā-ira 0.45 ki te hautau \frac{45}{100}. Whakahekea te hautanga \frac{45}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 5.

$$\left(\frac{3}{16}-\frac{9}{20}\right)\times 0.8-\frac{0.21}{0.2}$$

Ko te maha noa iti rawa atu o 16 me 20 ko 80. Me tahuri \frac{3}{16} me \frac{9}{20} ki te hautau me te tautūnga 80.

$$\left(\frac{15}{80}-\frac{36}{80}\right)\times 0.8-\frac{0.21}{0.2}$$

Tā te mea he rite te tauraro o \frac{15}{80} me \frac{36}{80}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{15-36}{80}\times 0.8-\frac{0.21}{0.2}$$

Tangohia te 36 i te 15, ka -21.

$$-\frac{21}{80}\times 0.8-\frac{0.21}{0.2}$$

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.

$$-\frac{21}{80}\times \frac{4}{5}-\frac{0.21}{0.2}$$

Me whakarea te -\frac{21}{80} ki te \frac{4}{5} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{-21\times 4}{80\times 5}-\frac{0.21}{0.2}$$

Mahia ngā whakarea i roto i te hautanga \frac{-21\times 4}{80\times 5}.

$$\frac{-84}{400}-\frac{0.21}{0.2}$$

Whakahekea te hautanga \frac{-84}{400} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.

$$-\frac{21}{100}-\frac{0.21}{0.2}$$

Whakarohaina te \frac{0.21}{0.2} mā te whakarea i te taurunga me te tauraro ki te 100.

$$-\frac{21}{100}-\frac{21}{20}$$

Ko te maha noa iti rawa atu o 100 me 20 ko 100. Me tahuri -\frac{21}{100} me \frac{21}{20} ki te hautau me te tautūnga 100.

$$-\frac{21}{100}-\frac{105}{100}$$

Tā te mea he rite te tauraro o -\frac{21}{100} me \frac{105}{100}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{-21-105}{100}$$

Tangohia te 105 i te -21, ka -126.

$$\frac{-126}{100}$$

Whakahekea te hautanga \frac{-126}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$-\frac{63}{50}$$

Tauwehe

$$-1.26$$