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a fost răspuns

Rezolvati ecuatiile va rog mult
2x+1=13-x

x+9=7-x

2+4x=2x+6

3x-8=5x+10

x+1+2x=15+4x

-2x+3=x+8+2×

Răspuns :

Merymerisor
2x+1=13-x
2x+x=13-1
3x=12
x=4

x+9=7-x
x+x=7-9
2x=-2
x= -1

2+4x=2x+6
-2x+4x=6-2
2x=4
x=2

3x-8=5x+10
-5x+3x=10-8
-2x=2
x= -1

x+1+2x=15+4x
3x+1=15+4x
3x-4x=15-1
-x=14 / (inmultesc relatia cu -1)
x= -14

-2x+3=x+8+2x
-2x+3=3x+8
3x-2x=8-3
x=5

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