bonjour

1/2 + 3/2 = 4/2 = 2

1/7 - 1 = 1 /7 - 7 /7 = - 6/7

( 2 √3)² = 12

(  √2 ) * ( √5 )   : √2

( √2 ) *√5 * √2 /2

= 2 √5 / 2

= √5

Salut, voici les simplifications :

[tex]\frac{1}{2} + \frac{3}{2} = \frac{1 + 3}{2} = \frac{4}{2} = 2[/tex]

[tex]\frac{1}{7} - 1 = \frac{1}{7} - \frac{7}{7} = \frac{1-7}{7} = -\frac{6}{7}[/tex]

[tex](2\sqrt{3})^2 = 2^2 \times \sqrt{3}^2 = 4 \times 3 = 12[/tex]

[tex]\frac{\sqrt{2} \times \sqrt{5}}{\sqrt{2}} = \sqrt{5}[/tex]