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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