x【x+1】分之1+【x+1】乘【x+2】分之1+······+【2x-1】乘2x分之1等于8分之1

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x【x+1】分之1+【x+1】乘【x+2】分之1+······+【2x-1】乘2x分之1等于8分之1x【x+1】分之1+【x+1】乘【x+2】分之1+······+【2x-1】乘2x分之1等于8分之1

x【x+1】分之1+【x+1】乘【x+2】分之1+······+【2x-1】乘2x分之1等于8分之1
x【x+1】分之1+【x+1】乘【x+2】分之1+······+【2x-1】乘2x分之1等于8分之1

x【x+1】分之1+【x+1】乘【x+2】分之1+······+【2x-1】乘2x分之1等于8分之1

所以x=4