[tex]a=15k+8[/tex] gdzie [tex]k\in\mathbb{Z}[/tex]
[tex]a-7=15k+8-7=15k+1[/tex] - ta nie, bo [tex]r=1[/tex]
[tex]a+15=15k+8+15=15k+23[/tex] - ta nie, bo [tex]r=23[/tex]
[tex]a-18=15k+8-18=15k-15+5=15(k-1)+5[/tex] - ta nie, bo [tex]r=5[/tex]
[tex]a+22=15k+8+22=15k+30=15(k+2)[/tex] - ta jest, bo [tex]r=0[/tex]
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[tex]a=15k+8[/tex] gdzie [tex]k\in\mathbb{Z}[/tex]
[tex]a-7=15k+8-7=15k+1[/tex] - ta nie, bo [tex]r=1[/tex]
[tex]a+15=15k+8+15=15k+23[/tex] - ta nie, bo [tex]r=23[/tex]
[tex]a-18=15k+8-18=15k-15+5=15(k-1)+5[/tex] - ta nie, bo [tex]r=5[/tex]
[tex]a+22=15k+8+22=15k+30=15(k+2)[/tex] - ta jest, bo [tex]r=0[/tex]