Sagot :
A = 3√20 + √45
A = 3√4*√5 + √9*√5
A = 3*2*√5 + 3√5
A = 6√5 + 3√5
A = (6 + 3)√5
A = 9√5
Pour le signe racine je mets /
A= 3/4x5 + /9x5
A= 3x 2 /5 + 3/5
A= 6/5 + 3/5
A= 9/5
A= 3/4x5 + /9x5
A= 3x 2 /5 + 3/5
A= 6/5 + 3/5
A= 9/5