Developpe et réduis les expression suivantes:
a) 3(-2x+5)+(-2x+5)(x-3)
b) (2a-5)(3-4a)-2(5-a)
c) -(3-4z)(z-2)
d) -5r(2-3r)+(-r-2)(2r+5)
attention au signe + et -
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