Datrys 21/4div51/2

$$2 \frac { 1 } { 4 } \div 5 \frac { 1 } { 2 }$$

Enrhifo

$$\frac{9}{22}\approx 0.409090909$$

Camau Ateb

Rhannwch \frac{2\times 4+1}{4} â \frac{5\times 2+1}{2} drwy luosi \frac{2\times 4+1}{4} â chilydd \frac{5\times 2+1}{2}.

$$\frac{\left(2\times 4+1\right)\times 2}{4\left(5\times 2+1\right)}$$

Canslo 2 yn y rhifiadur a'r enwadur.

$$\frac{1+2\times 4}{2\left(1+2\times 5\right)}$$

Lluosi 2 a 4 i gael 8.

$$\frac{1+8}{2\left(1+2\times 5\right)}$$

Adio 1 a 8 i gael 9.

$$\frac{9}{2\left(1+2\times 5\right)}$$

Lluosi 2 a 5 i gael 10.

$$\frac{9}{2\left(1+10\right)}$$

Adio 1 a 10 i gael 11.

$$\frac{9}{2\times 11}$$

Lluosi 2 a 11 i gael 22.

$$\frac{9}{22}$$

Ffactor

$$\frac{3 ^ {2}}{2 \cdot 11} = 0.4090909090909091$$