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Sagot :

Bonjour,

A = (5-2x)(5-2x)

  = 5²-2×5×2x+(2x)²

  = 4x²-20x+25

B = (3y-2)(1-2y)

   = 3y-6y²-2+4y

   = -6y²+7y-2

C = -5x(3-2x)+(x-3)(x+2)

   = -15x+10x²+x²+2x-3x-6

   = 11x²-16x-6

D = (1-2t)(t+4)-(1-t)(1-t)

   = t+4-2t²-8t-(1-2t+t²)

   = -3t²-5t+3

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