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c)
5,4:7½=x:0,5
7,5x=2,7
x=036
d)
2⅔:3 i trzy siódme =7:x
2⅔x=24
x=9
4.
a)
4/x=5/9
36=5x
-5x=-36
x=7,2
b)
x/1,2=1,2/4
4x=1,44
x=0,36
c)
3,2/2,8=x/3,5
11,2=2,8x
-2,8x=-11,2
x=4
d)
9,36/7,2=1,3/x
9,36x=9,36
x=1
e)
0,6/x=0,8/6
3,6=0,8x
-0,8x=-3,6
x=4,5
f)
x/0,6=6/0,8
0,8x=3,6
x=4,5
g)
x-5/7=3/5
5x-25=21
5x=21+25
5x=46
x=9,2
h)
x/3=x+5/2
2x=3x+15
2x-3x=15
-x=15
x=-15
i)
4/x+6=5/7+x
28+4x=5x+30
4x-5x=30-28
-x=2
x=-2