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Sagot :

Bonjour,

A=

3x -5 +10x -10 = 13x -15

B=

4y- 18 +12y +4y -4 = 20y -22

C=

5t² + 6t -9 -2t² +10 = 3t² +6t +1
A=3x-5+5(2x-2)
=3x-5+5*2x+5*(-2)
=3x-5+10x-10
=13x-15

B=4y-6(3-2y)+4(y-1)
=4y-6*3-6*(-2y)+4*y+4*(-1)
=4y-18+12y+4y-4
=20y-22

C=5t(au carré)+3(2t-3)-2t(t-5)
=5t(au carré)+3*2t+3*(-3)-2t*t-2t*(-5)
=5t(au carré)+6t-9-2t(au carré)+10t
=3t(au carré)+16t-9
Voilà☺️

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