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Sagot :

Bonsoir,

1° formule:

addition des 4 rectangles

xy + 18x + 18*12 +12y

= ( xy + 18x + 12y +216) cm²

2° formule

L*l

(y+18)( x+12)

= xy +12y + 18x +18*12

= (xy +18x +12y + 216)cm²

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