因为1/(1×3)=1/2×(1-1/3),1/(3x5)=1/2×(1/3-1/5),1/(5×7)=1/2×(1/5-1/7),……,
所以所以1/(1×3)+1/(3×5)+1/(5×7)+……+1/(17+19)=1/2×(1-1/19)=109/19(1)在和式1/(1×3)+1/(3×5)+......
所以所以1/(1×3)+1/(3×5)+1/(5×7)+……+1/(17+19)=1/2×(1-1/19)=109/19
(1)在和式1/(1×3)+1/(3×5)+.........中,第四项为(),第n项为();
(2)运用上述结论计算1/【(x-1)x】+1/【x(x+1)】+1/【(x+1)(x+2)】+1/【(x+2)(x+3)] 展开
(1)在和式1/(1×3)+1/(3×5)+.........中,第四项为(),第n项为();
(2)运用上述结论计算1/【(x-1)x】+1/【x(x+1)】+1/【(x+1)(x+2)】+1/【(x+2)(x+3)] 展开
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