Løs x^2/x-1leqx+1

$$\frac { x ^ { 2 } } { x - 1 } \leq x + 1$$

Løs for x

$$x<1$$

Løsningsvejledning

Subtraher x fra begge sider.

$$\frac{x^{2}}{x-1}-x\leq 1$$

For tilføje eller fratrække udtryk skal du udvide dem for at gøre nævneren ens. Multiplicer x gange \frac{x-1}{x-1}.

$$\frac{x^{2}}{x-1}-\frac{x\left(x-1\right)}{x-1}\leq 1$$

Eftersom \frac{x^{2}}{x-1} og \frac{x\left(x-1\right)}{x-1} har den samme fællesnævner, kan du trække dem fra dem ved at trække deres tællere fra.

$$\frac{x^{2}-x\left(x-1\right)}{x-1}\leq 1$$

Lav multiplikationerne i x^{2}-x\left(x-1\right).

$$\frac{x^{2}-x^{2}+x}{x-1}\leq 1$$

Kombiner ens led i x^{2}-x^{2}+x.

$$\frac{x}{x-1}\leq 1$$

Denominator x-1 cannot be zero since division by zero is not defined. There are two cases.

$$x-1>0 x-1<0$$

Consider the case when x-1 is positive. Move -1 to the right hand side.

$$x>1$$

The initial inequality does not change the direction when multiplied by x-1 for x-1>0.

$$x\leq x-1$$

Move the terms containing x to the left hand side and all other terms to the right hand side.

$$x-x\leq -1$$

Kombiner ens led.

$$0\leq -1$$

Consider condition x>1 specified above.

$$x\in \emptyset$$

Now consider the case when x-1 is negative. Move -1 to the right hand side.

$$x<1$$

The initial inequality changes the direction when multiplied by x-1 for x-1<0.

$$x\geq x-1$$

Move the terms containing x to the left hand side and all other terms to the right hand side.

$$x-x\geq -1$$

Kombiner ens led.

$$0\geq -1$$

Consider condition x<1 specified above.

$$x<1$$

Den endelige løsning er foreningen af de hentede løsninger.

$$x<1$$