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Efectuati:
a) (-2) * (-5)
b) (-7) * (+3)
c) 18 * (-1)
d) 9 * (+3)


Răspuns :

[tex](-2) * (-5) = +10[/tex]

[tex](-7) * (+3) = -21[/tex]

[tex]18 * (-1) = -18[/tex]

[tex]9 * (+3) = +27 [/tex]

[tex]-11 * (+4) = -44[/tex]
a)(-2)·(-5) =+10
b)(-7)·(x+3)=-21
c)18·(-1)=-18
d)9·(x+3)=+27
e)-11·(x+4)=-44