Sagot :
bonjour
a) 10(4 + 3x)
=10*4+10*3x
=40+30x
b) x(17 - 2x)
=x*17-x*2x
=17x-2x²
c) 8(1,5 + x + 6y)
=8*1.5+8*x+8*6y
=12+8x+48y
d) (x - y) x 5
=5x*x-5x*y
=5x²-5xy
ex 5
a) y(2x + 13y)=2xy+13y²
vrai
b) (y-3) *y=y²-3y
vrai
c)5(4 x z)=5(4z)=20z
faux
d)t(8-7)=8t-7t=1t=t
vrai