1/1×2+1/2×3+1/3×4+.+1/9×10=
1个回答
=1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1-1/10
=9/10
相关问题
1/1×2×3+1/2×3×4+1/3×4×5······+1/8×9×10+1/9×10×11等于多少
1/1×2×3+1/2×3×4+1/3×4×5+.+1/9×10×11
1/1×2+1/2×3+1/3×4+…1/8×9+1/9×10=?
(1)[1/1×2]+[1/2×3]+[1/3×4]+…+[1/9×10]
4、计算(1/(1×2)+2/(1×2×3)+3/(1×2×3×4)+……+9/(1×2×3×……×10)的值为
1、(1/10×1/9×1/8×……×1/2×1)^10×(1×2×3×……×9×10)^10
1/1×2+2/1×2×3+3/1×2×3×4+…+8/1×2×…×9=?
一道数学题 简算 1/1× 2× 3+1/2×3×4+1/3×4×5+······+1/9×10×11=?
计算这个有趣的算式1/1×2+1/2×3+1/3×4+````````+1/8×9+1/9×10(提示:1/1×2=1-