Datrys 9*8-9*15*0.02/900*(1-0.15)

$$\frac { 9 \times 8 - 9 \times 15 \times 0.02 } { 900 \times ( 1 - 0.15 ) }$$

Enrhifo

$$\frac{77}{850}\approx 0.090588235$$

Camau Ateb

Lluosi 9 a 8 i gael 72.

$$\frac{72-9\times 15\times 0.02}{900\left(1-0.15\right)}$$

Lluosi 9 a 15 i gael 135.

$$\frac{72-135\times 0.02}{900\left(1-0.15\right)}$$

Lluosi 135 a 0.02 i gael 2.7.

$$\frac{72-2.7}{900\left(1-0.15\right)}$$

Tynnu 2.7 o 72 i gael 69.3.

$$\frac{69.3}{900\left(1-0.15\right)}$$

Tynnu 0.15 o 1 i gael 0.85.

$$\frac{69.3}{900\times 0.85}$$

Lluosi 900 a 0.85 i gael 765.

$$\frac{69.3}{765}$$

Ehangu \frac{69.3}{765} drwy luosi'r rhifiadur a'r enwadur gyda 10.

$$\frac{693}{7650}$$

Lleihau'r ffracsiwn \frac{693}{7650} i'r graddau lleiaf posib drwy dynnu a chanslo allan 9.

$$\frac{77}{850}$$

Ffactor

$$\frac{7 \cdot 11}{2 \cdot 17 \cdot 5 ^ {2}} = 0.09058823529411765$$