zamien na ułamek zwykły liczbę 0.8(74)
0.8(74)=?10x=8.7474...1000x=874.7474...1000x- 10x= 874.7474...-8.7474...990x=866x=866/990x=433/4950.8(74)=433/495
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0.8(74)=?
10x=8.7474...
1000x=874.7474...
1000x-
10x=
874.7474...-8.7474...
990x=866
x=866/990
x=433/495
0.8(74)=433/495