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Do tego trzeba dodać 0,5.
Czyli
8/90 + 5/10 = 8/90 + 45/90 = 53/90
I taka jest odpowiedź: 53/90
0,5(8)=0,5+0,088888888...
x=0,088888888...
10x=0,88888888...
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9x=0,8
x=0,8/9
x=8/90
0,5(8)=0,5+x
0,5(8)=0,5+8/90=5/10+8/90=45/90+8/90=53/90