Oblicz wyraz pierwszy a1 i roznice r ciagu arytmetycznego w ktorym a2=6 a roznica a7-a4=12
6=a1+r=>a1=6-r a7=6-r+6r=6+5r a4=6-r+3r=6+2r 6+5r-(6+2r)=12 3r=12 r=4 a1=6-4=2
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6=a1+r=>a1=6-r
a7=6-r+6r=6+5r
a4=6-r+3r=6+2r
6+5r-(6+2r)=12
3r=12
r=4
a1=6-4=2