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Sagot :

a. 3*x*x*(-2)
=3*x^2*(-2)
=-6*x^2
b. (-5)*y*(-7)*z
=(-5)*(-7)*y*z
=35*y*z
c.3z*(-2z)*z
=-6z^2*z
=6z^3
d. -4ab*6a*(-5ab)
=-24*a^2*b*(-5ab)
=120*a^3*b^2

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