Répondre :
124 124 124 118² - 124 124 124 120 X 124 124 124 115
on pose x=124 124 124 118
x²-(x+2)(x-3)
=x²-(x²-x-6)
=x+6
=124 124 124 124
on pose x=124 124 124 118
x²-(x+2)(x-3)
=x²-(x²-x-6)
=x+6
=124 124 124 124