Datrys {l}{-15+10+7-8=-6quad-33}{42+(-5)-(-39)+4=(42+-5)(39+4)}

$$\left. \begin{array} { l } { - 15 + 10 + 7 - 8 = - 6 \quad - 33 } \\ { 42 + ( - 5 ) - ( - 39 ) + 4 = ( 42 + - 5 ) ( 39 + 4 ) } \end{array} \right.$$

Gwireddu

Camau Ateb

Adio -15 a 10 i gael -5.

$$-5+7-8=-6-33\text{ and }42-5-\left(-39\right)+4=\left(42-5\right)\left(39+4\right)$$

Adio -5 a 7 i gael 2.

$$2-8=-6-33\text{ and }42-5-\left(-39\right)+4=\left(42-5\right)\left(39+4\right)$$

Tynnu 8 o 2 i gael -6.

$$-6=-6-33\text{ and }42-5-\left(-39\right)+4=\left(42-5\right)\left(39+4\right)$$

Tynnu 33 o -6 i gael -39.

$$-6=-39\text{ and }42-5-\left(-39\right)+4=\left(42-5\right)\left(39+4\right)$$

Cymharu -6 gyda -39.

$$\text{false}\text{ and }42-5-\left(-39\right)+4=\left(42-5\right)\left(39+4\right)$$

Tynnu 5 o 42 i gael 37.

$$\text{false}\text{ and }37-\left(-39\right)+4=\left(42-5\right)\left(39+4\right)$$

Gwrthwyneb -39 yw 39.

$$\text{false}\text{ and }37+39+4=\left(42-5\right)\left(39+4\right)$$

Adio 37 a 39 i gael 76.

$$\text{false}\text{ and }76+4=\left(42-5\right)\left(39+4\right)$$

Adio 76 a 4 i gael 80.

$$\text{false}\text{ and }80=\left(42-5\right)\left(39+4\right)$$

Tynnu 5 o 42 i gael 37.

$$\text{false}\text{ and }80=37\left(39+4\right)$$

Adio 39 a 4 i gael 43.

$$\text{false}\text{ and }80=37\times 43$$

Lluosi 37 a 43 i gael 1591.

$$\text{false}\text{ and }80=1591$$

Cymharu 80 gyda 1591.

$$\text{false}\text{ and }\text{false}$$

Cysylltydd \text{false} a \text{false} yw \text{false}.

$$\text{false}$$