Liczby x = 0.(6) i y = 4.(36) przedstaw w postaci ułamka zwykłego, a następnie oblicz x+y, x·y, x/y . / - kraska ułamkowa.
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x=0,6666666.... |*100
100x=66,66666... |:10
10x=6,66666...
90x=66,66666....-6,66666...
90x=60 |:90
x= 60/90 : 10/10
x=6/9
y=4,363636 |*10 000
10 000y=436 36,363636... |:100
100y = 436,363636...
9 900y = 43 636,363636... - 436,363636...
9 900y = 43 200 |:9900
y=43200 : 9900
y=432/99 : 9/9
y=48/11 = 4 i 4/11
x=6/9
y= 4 i 4/11 = 48/11
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x=0,66666666666
10x=6,66666666666
10x-x=6
9x=6
x=6/9
x=⅔
...................
y=4,363636
10y=43,63636
100y=436,363636
100y-y=436-4
99y=432
y=432/99=48/11
........................
x+y=⅔+48/11=22/33+144/33=166/33=5¹/₃₃
x-y=⅔-48/11=22/33-144/33=-122/33=-3²³/₃₃
x/y=⅔:48/11=2/3*11/48=11/72
x*y=⅔×48/11=32/11=2¹⁰/₁₁