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Sagot :

NIINII

A= 3x - 5 + 5(2x -2)

  = 3x  - 5 +10x  - 10

  = 3x +10x -5-10

  = 13x   -15

 

B= 4y - 6(3-2y) + 4(y-1)

   = 4y - 18 -12y + 4y - 4

   = 4y -12y + 4y -18-4

   = -4y  -22

 

C= 5t² + 3(2t-3) -2t(t-5)

   = 5t²  + 6t-9     - 2t² +10t

   = 5t² - 2t² + 6t +10t -9

   = 3t²            +16t  -9

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