bonsoir
4 x² = ( 2 x )²
9 x² = ( 3 x )²
36 x² = ( 6 x )²
25 x² = ( 5 x )²
49 x² = ( 7 x )²
81 x² = ( 9 x )²
100 t² = ( 10 t )²
400 a² = ( 20 a)²
144 b² = ( 12 b)²
16 y² = ( 4 y )²
