bonjour
2 ( 2 x + 4 x + 1.5 ) = 4 x + 8 x + 3 = 12 x + 3
périmètre rectangle = 12 x + 3
12 x +3 = 15
12 x = 15 - 3
12 x = 12
x = 1
3 ( 4 x + 1 ) = 12 x + 3
12 x + 3 = 12 x +3
donc vrai
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bonjour
2 ( 2 x + 4 x + 1.5 ) = 4 x + 8 x + 3 = 12 x + 3
périmètre rectangle = 12 x + 3
12 x +3 = 15
12 x = 15 - 3
12 x = 12
x = 1
3 ( 4 x + 1 ) = 12 x + 3
12 x + 3 = 12 x +3
donc vrai