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a1=2a2=2+4=2*3a3=2+4+6=3*4a4=2+4+6+8=4*5a5=2+4+6+8+10=5*6.an=2+4+6+8+10+…+2n=2(1+2+3+4+5+…+n)= n(n+1)∴An=n(n+1)+13這是我在靜心思考後得出的結論,如果不能請追問,我會盡全力幫您解決的~如果您有所不滿願…
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