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an=4+(n-1)*(-4)
an=4-4n+4
an=-4n+8= wzór ogólny
a11=-4*11+8
a11=-36
lub tak;
a11=a1+10=4+10*(-4)=4-40=-36
S11=[a1+a11]/2 *11=[4-36] /2 *11=- 176
S11=[a1+a11]/2 *11=[4-36] /2 *11=176
Mam nadzieje,ze pomoglam :)