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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

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