Réponses

2013-11-25T18:56:33+01:00
A (t+1/4)²
=t²+2/4t+1/16
=t²+1/2t+1/16

b(y+2/5) (y-2/5)
=y²-(2/5)²
=y²-4/25

c (4x-3/8 )²
=16x²-2*4x*3/8+(3/8)²
=16x²-24/8x+9/64
=16x²-3x+9/64

d (3x+7/2)²
=9x²+2*3x*7/2+(7/2)²
=9x²+42/2x+49/4
=9x²+21x+49/4

e (2/3w+ 5) (5- 2/3w) 
=10/3w-4/9w²+25-10/3w
=-4/9w²+25