a)
x=0,2(6)
10x = 2,6(6)
10x-x = 2,6(6)-0,2(6)
9x = 2,4
9x = 24/10 |:9
x = 24/90 = 4/15
b)
x = 0,41(6)
1000x = 416,(6)
100x = 41,(6)
1000x-100x = 416,(6)-41,(6)
900x = 375 |:900
x = 375/900 = 5/12
c)
x = 1,2(13)
1000x = 1213,(13)
10x = 12,(13)
1000x - 10x = 1213,(13)-12,(13)
900x = 1201/:990
x = 1201/990
d)
x = -2,34(5)
1000x = -2345,(5)
100x = -234,(5)
1000x-100x = -2345,(5)-[-234,(5)]
900x = -2111 |:900
x = -2111/900