Datrys 100-4.2*(32.5-17.5/(138.7-137)

$$\frac{ 100-4.2 \times (32.5-17.5 }{ (138.7-137) }$$

Enrhifo

$$\frac{1070}{17}\approx 62.941176471$$

Camau Ateb

Tynnu 17.5 o 32.5 i gael 15.

$$100-\frac{4.2\times 15}{138.7-137}$$

Lluosi 4.2 a 15 i gael 63.

$$100-\frac{63}{138.7-137}$$

Tynnu 137 o 138.7 i gael 1.7.

$$100-\frac{63}{1.7}$$

Ehangu \frac{63}{1.7} drwy luosi'r rhifiadur a'r enwadur gyda 10.

$$100-\frac{630}{17}$$

Troswch y rhif degol 100 i’r ffracsiwn \frac{1700}{17}.

$$\frac{1700}{17}-\frac{630}{17}$$

Gan fod gan \frac{1700}{17} a \frac{630}{17} yr un dynodydd, tynnwch nhw drwy dynnu eu rhifiaduron.

$$\frac{1700-630}{17}$$

Tynnu 630 o 1700 i gael 1070.

$$\frac{1070}{17}$$

Ffactor

$$\frac{2 \cdot 5 \cdot 107}{17} = 62\frac{16}{17} = 62.94117647058823$$