2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

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2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=
x)3:ӍԆO7ELO7GOlm׬_`gCݶ@ M)6@H[iCCmb"& ~qAbq$zi

2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=
2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=

2÷(1×3)+2÷(3×5)+2÷(5×7)+2÷(7×9)=
=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15
=1-1/15
=14/15