$$\frac{a+b}{a^2-b^2}$$

$$\frac{a^2-b^2}{a-b}$$

$$\frac{a^2+b^2}{a-b}$$

$$\frac{a^2+ab}{a^2-b^2}$$

Vero

Falso

$$6a-b$$  

$$\frac{2a-3b}{3a}$$  

$$\frac{2-ab}{3}$$  

$$\frac{2-ab}{a}$$  

0

$$\frac{x-3a}{x}$$  

$$\frac{x-3a}{x\left(x-2a\right)}$$  

$$\frac{x-3a}{x\left(x-2a\right)^2}$$  

nessuna delle precedenti

$$\frac{1}{3\left(y-2\right)}$$  

$$\frac{y}{3\left(y-2\right)}$$  

$$\frac{1}{3y\left(y-2\right)}$$  

$$\frac{y-2}{3\left(y^2-4y+4\right)}$$  

$$\frac{6}{5-x}$$  

0

$$\frac{6}{x-5}$$  

nessuna delle altre

$$\frac{1-x}{2x-2}$$  

$$\frac{1+2x}{2x-2}$$  

$$\frac{1+x}{2\left(x-1\right)}$$  

$$\frac{1-2x}{2\left(x-1\right)}$$  

$$\frac{x+6}{x+7}$$  

$$\frac{x+4}{x+7}$$  

$$\frac{x+2}{x+7}$$  

$$\frac{x+1}{x+7}$$  

0

$$\frac{x-3a}{x}$$  

$$\frac{x-3a}{x\left(x-2a\right)}$$  

$$\frac{x-3a}{x\left(x-2a\right)^2}$$  

nessuna delle precedenti

$$b+1$$  

$$1-b$$  

$$b-1$$  

2

nessuna delle precedenti

$$\frac{x^2+x}{x+1}$$  

$$\frac{x^2+x}{x+2}$$  

$$\frac{x^2+x}{x+5}$$  

$$\frac{x^2+x}{x-5}$$  

nessuna delle precedenti