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a)2/x=3/x-1
2*(x-1)=x*3
2x-2=3x
2x-3x=2
-x=2 |*(-1)
x=-2
b)4/x+1=5/x
4*x=(x+1)*5
4x=5x+5
4x-5x=5
-x=5 |*(-1)
x=-5
2(x-1)=3x
2x-2=3x
-2=3x-2x
-2=x
b) 4/x+1=5/x
4x=5(x+1)
4x=5x+5
4x-5x=5
-x=5/*(-1)
x=-5
wymnażam "na krzyż":
2(x-1)=3x
2x-2=3x
2x-3x=2
-x=2
x=-2
spr.
2/x=2/(-2)=-1
3/x-1=3/(-2-1)=3/(-3)=-1
b)4/x+1=5/x
4x=5(x+1)
4x=5x+5
4x-5x=5
-x=5
x=-5
spr.
4/x+1=4/(-5+1)=4/(-4)=-1
5/x=5/(-5)=-1