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rezolvati ecuatiile a) 2x-1=0 b) 2x+2=x-5 c) 3x-2(x+1)+4x d) 3x-5+5(x+2) e) 7(x+2)-3(x-7=11-3)(2x+6)

Răspuns :

Alexandra450
a)2x=1->x=1 pe 2 \\ b)2x-x=-2-5 -> x=-7 \\ c)3x-2x-2+4x=0 -> 3x-2x+4x=2-> 5x=2-> x=2 pe 5 \\ d) 3x-5+5x+10=0-> 3x+5x=5-10->8x=-5->x=-5 pe 8 \\ e) 7x+14-3x+21=16x+24 -> 7x -3x -16x=-14-21+24 -> -12x=-11 -> x=11 pe 12
a) 2x-1=0
2x=1
x=1/2
S={1/2}

b) 2x+2=x-5
2x-x=-5-2
x=-7
S={-7}

c) 3x-2(x+1)+4x=0
3x-2x-2+4x=0
5x=2
x=5/2
S={5/2}

d) 3x-5+5(x+2)=0
3x-5+5x+10=0
8x=-5
x=-5/8
S={-5/8}

e) 7(x+2)-3(x-7)=(11-3)(2x+6)
7x+14-3x+21=16x+48
4x-16x=48-35
-12x=13
x=-13/12
S={-13/12}

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