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Answered

Résoudes les équations suivantes.N'oublis pas de mettre la vérification.
1) 5(x+2)=6(2x-7)
2) -3(3-x)=4(3x-6)
3) 4x(x-2)=4x(au carré)+6x-8
4) (5x+2)(4x-3)=20x(au carré)-6x+40
5) (4-3x)(5x+8)=38-15x(au carré)

Sagot :

5(x+2)=6(2x-7)        -3(3-x)=4(3x-6)                4x(4x-2)=4xcarré+6x -8
                                  -9+3x=12x-24                16xcarré-8x=16xcarré+6x-8
5x+10=12x-42            3x-12x=-24+9                 16xcarré-16xcarré-8x-6x=-8  
5x-12x=-42-10             - 9x=-15                         -14x=-8
-7x=-52                          x=-15/-9                         x=-8/-14
x=-52/-7                         x=5/3                               x=4/7  
x=52/7

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