Exercice 61 :
a) 2b *5b = 10b²
b) -6 * -4 = 24
c) -5t *6 = -30t
d) -8a*100a = -800a²
e) 2y * -t tu ne peux rien faire
f) -4x * 0x = 0
g) -9x *(-1) = 9x
h) (-2x) *8 * (-10x)
= -16x * -10x
=160x²
Exercice 62:
a) 5 * 5x + 4 *x *2
=25x + 8x
= 33x
b) 3a -9a
= -6a
c) 3x *9 x -6x *x
= 27x² - 6x²
= 21x²
d) 3a *5a +8
= 15a² +8
e)5a * 7ab² +3
f)-8y *2y -(-4y) *7y + 9y * -6
= -16y² + 28y² - 54y
=12y² -54y
