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a)2x-5/3=4/5
12=10x-25
10x=37/10
x=3,7
b)10/1,5=8/9-3x
12=90-30x
30x=78/30
x=2,6
2.
a)2/x=3/x-1
3x=2x-2
x=-2
b)4/x+1=5/x
4x=5x+5
-x=5
x=-5
c)3/5=2x-1/2-5x
10x-5=6-15x
25x=11/25
x=0,44
d)2x+1/1-2x=2/3
6x+3=2-4x
10x=-1/10
x=-0,1
e)0,4x-1/3=2x-5/2
6x-15=0,8x-2
5,2x=13/5,2
x=2,5
2x-5/3=4/5 /×15
5(2x-5)=12
10x-25=12
10x=37
x=3,7
2.
10/1,5=8/9-3x
10(9-3x)=8×1,5
90-30x=12
-30x=-78
x=2,6
Zad 2
1. 2/x=3/x-1
2(x-1)=3x
2x-2=3x
-2=x
x=-2
2. 4/x+1=5/x
4x=5(x+1)
4x=5x+5
x=-5
3. 3/5=2x-1/2-5x
3(2-5x)=5(2x-1)
6-15x=10x-5
11=25x
x=0,44
4. 2x+1/1-2x=2/3
3(2x+1)=2(1-2x)
6x+3=2-4x
10x=-1
x=-0,1
5. 0,4x-1/3=2x-5/2
2(0,4x-1)=3(2x-5)
0,8x-2=6x-15
13=5,2x
x=2,5