racine carrée 21 et 22 pas de calculette ,calculer chaque expression sous la forme du nombre entier ou d'une fraction

A= //50 * //2
//50*2=
//100=
10

B= //8,1 * //10
= //8,1*10 
= //81
= 9

C= //3 * //27
= //3*27
= //81
= 9

D= //18 * //2
= //18*2
= //36
= 6

A= //2 * //32
= //2*32
= //64
= 8

B= //72 * //2
= //72*2
= //144
=012

C= //90 * //10
= //90*10
= //900
= 30

D=//60,5 *//2
= //60,5*2
= //121
= 11


// veut dire racine carrée
* veut dire multiplier