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Sagot :

Bonjour,

Nina:

3

3-1 = 2

2*-2 = -4

-4+2 = -2

Claire:

5

5*-1/2 =  -5/2

-5/2 + 1 = -5/2  + 2/2 = -3/2  = -1,5

3)

Nina :

x

x-1

-2(x-1) = -2x +2

-2x+2 +2 = -2x+4

Claire :

x

-x/2

-x/2 +1 =

-2x+4 = 4( -x/2 +1)

vrai ou faux?

-2x+4 = -4x/2 +4

-2x+4 = -2x +4

Vrai!!

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