简便计算题1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+10/(3*5*7*9*11)+1/(3*5*7*9*11)

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简便计算题1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+10/(3*5*7*9*11)+1/(3*5*7*9*11)简便计算题1/3+4/(3*5)+6/(3*5*7)+8/(3

简便计算题1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+10/(3*5*7*9*11)+1/(3*5*7*9*11)
简便计算题1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+10/(3*5*7*9*11)+1/(3*5*7*9*11)

简便计算题1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+10/(3*5*7*9*11)+1/(3*5*7*9*11)
1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+10/(3*5*7*9*11)+1/(3*5*7*9*11)
=1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+1/(3*5*7*9*11)*(10+1)
=1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+11/(3*5*7*9*11)
=1/3+4/(3*5)+6/(3*5*7)+8/(3*5*7*9)+1/(3*5*7*9)
=1/3+4/(3*5)+6/(3*5*7)+1/(3*5*7*9)*(8+1)
=1/3+4/(3*5)+6/(3*5*7)+9/(3*5*7*9)
=1/3+4/(3*5)+6/(3*5*7)+1/(3*5*7)
=1/3+4/(3*5)+1/(3*5*7)*(6+1)
=1/3+4/(3*5)+7/(3*5*7)
=1/3+4/(3*5)+1/(3*5)
=1/3+1/(3*5)*(4+1)
=1/3+1/(3*5)*5
=1/3+1/3
=2/3

10/(3*5*7*9*11)+1/(3*5*7*9*11)=1/(3*5*7*9)从后依次往前算