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b1=a2:a1=7/1=7/1
b2=a3:a2=8/2=28/7
b3=a4:a3=9/3=84/28
b4=a5:a4=10/4=210/84
b5=a6:a5=11/5
b6=a7:a6=12/6
......
b49=a50:a49=55/49
b1*b2*b3*......*b49
=(a2:a1)*(a3:a2)*...*(a50:a49)=(7/1)*(8/2)*(9/3)*...*(55/49)
=a50:a1=(7*8*9*...*49)*50*51*52*53*54*55/(1*2*3*4*5*6*(7*8*...*49))
=a50:a1=50*51*...*55/(1*2*...*6)
= 》a50=50*51*52*53*54*55/(1*2*3*4*5*6)*a1
=28989675
b2=a3:a2=8/2=28/7
b3=a4:a3=9/3=84/28
b4=a5:a4=10/4=210/84
b5=a6:a5=11/5
b6=a7:a6=12/6
......
b49=a50:a49=55/49
b1*b2*b3*......*b49
=(a2:a1)*(a3:a2)*...*(a50:a49)=(7/1)*(8/2)*(9/3)*...*(55/49)
=a50:a1=(7*8*9*...*49)*50*51*52*53*54*55/(1*2*3*4*5*6*(7*8*...*49))
=a50:a1=50*51*...*55/(1*2*...*6)
= 》a50=50*51*52*53*54*55/(1*2*3*4*5*6)*a1
=28989675
追问
你能给出求和表达式吗?
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