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3-588,3
10-x
3x=5883/:3
x=1961
1961-rok
b.
10-6506 2/3
3-x
10x=19520/:10
x=1952
1961-1952=9
9-miesiąc
c.
9-100
x= 333 1/3
100x=3000/:100
x=30
30-dzień