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Sagot :

A = 5(2x-3)
= 5*2x-5*3
= 10x-15

B =7x(-3x+9)
=7x*(-3x)+7x*9
=-21x+63

C =2(x-7)-4(3x+6)
=2*x-2*7-4*3x+(-4)*6
= 2x-14-12x-24
=2x-12x-14-24 (On rassemble les x avec les x ect…)
=-10x-38

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