Réponse :
1) x=1-1
x=0
2) 2x=3+1
2x=4
x=4/2=2
3) -3x=-5-4
3x=9
x=9/3=3
4)-3x-2x=-2-2
-5x=-4
x=4/5
5)6x²=6
x²=1
x=√1 ou-√1
6)-6x+3-3-1-x=-5x+1
-7x-1=-5x+1
-7x+5x=2
-2x=2
x=-1
7) (2-x)/x=(x-1)/x
2-x=x-1
-x-x=-1-2
-2x=-3
x=3
9) x=1
x=-3
10) (x-1)²=0
x=1
bonus:
16x²-25 =(4x-5)(4x+5)
8x-10=2(4x-5)
(4x-5)(4x+5)-2(4x-5)=0
(4x-5)(4x+5+2)=0
(4x-5)(4x+7)=0
4x-5=0
4x=5
x=5/4
4x+7=0
4x=-7
x=-7/4
Explications étape par étape
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Réponse :
1) x=1-1
x=0
2) 2x=3+1
2x=4
x=4/2=2
3) -3x=-5-4
3x=9
x=9/3=3
4)-3x-2x=-2-2
-5x=-4
x=4/5
5)6x²=6
x²=1
x=√1 ou-√1
6)-6x+3-3-1-x=-5x+1
-7x-1=-5x+1
-7x+5x=2
-2x=2
x=-1
7) (2-x)/x=(x-1)/x
2-x=x-1
-x-x=-1-2
-2x=-3
x=3
9) x=1
x=-3
10) (x-1)²=0
x=1
bonus:
16x²-25 =(4x-5)(4x+5)
8x-10=2(4x-5)
(4x-5)(4x+5)-2(4x-5)=0
(4x-5)(4x+5+2)=0
(4x-5)(4x+7)=0
4x-5=0
4x=5
x=5/4
4x+7=0
4x=-7
x=-7/4
Explications étape par étape