am-bm/am+an-bm-bn*m^2+4mn+3n^2/2m^2+6mn

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am-bm/am+an-bm-bn*m^2+4mn+3n^2/2m^2+6mn
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am-bm/am+an-bm-bn*m^2+4mn+3n^2/2m^2+6mn
am-bm/am+an-bm-bn*m^2+4mn+3n^2/2m^2+6mn

am-bm/am+an-bm-bn*m^2+4mn+3n^2/2m^2+6mn
∵a10=(a1+a19)/2
∴S(2*9+1)=s19=(a1+a19)*19/2=a10*19
∵b5=(b1+b9)/2
∴T9=(b1+b9)*9/2=b5*9
∵S19/T9=19/(9+4)=19/13
∴a10*19/(b5*9)=19/13
∴a10/b5=9/13