Question

Rezolvati in multimea nr rationale ecuatiile: a) 2x+3=x-5 ; b) 5x-6=7+2x;c)8x+2x+11=20-x;d)4x+1=6x-3;e)2(x-1)+1=x+8;f)5x-(x-1)=9-4x. va rog repedeee!

Answer 1

a) 2x+3=x-5
2x-x=-5-3
x=-6
b) 5x-6=7
5x=7+6
5x=13
x=13:5
x=2,6
c) 8x+2x+11=20
10x=20-11
10x=9
x=9:10=0,9
d) 4x+1=6x-3
4x-6x=-3-1
-2x=-4
x=-4:-2
x=+2
e) 2(x-1)+1=x+8
2x-2+1=x+8
2x-1=8x+8
2x-8x=8+1
-6x=9
x=9:-6
x=-1,5
f)5x-(x-1)=9-4x
5x-x+1=9-4x
4x+1=9-4x
4x+4x=9-1
8x=8
x=8:8
x=1