1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/502.19+9又1/2+7又1/4+3又1/8+8又1/16+4又1/323.(1+1/2+1/3+1/4)*(1/2+1/31/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3*1/4)

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1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/502.19+9又1/2+7又1/4+3又1/8+8又1/16+4又1/323.(1+1/2+1/3+1/4)*(1/2+1/31/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3*1/4)
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1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/502.19+9又1/2+7又1/4+3又1/8+8又1/16+4又1/323.(1+1/2+1/3+1/4)*(1/2+1/31/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3*1/4)
1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/50
2.19+9又1/2+7又1/4+3又1/8+8又1/16+4又1/32
3.(1+1/2+1/3+1/4)*(1/2+1/31/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3*1/4)

1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/502.19+9又1/2+7又1/4+3又1/8+8又1/16+4又1/323.(1+1/2+1/3+1/4)*(1/2+1/31/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3*1/4)
1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/50=1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+...+49/50=1/2+2/2+3/2+4/2+5/2+...+49/2=1/2(1+2+3+4+5+...+49)=1225/2=612又1/2
2.19+9又1/2+7又1/4+3又1/8+8又1/16+4又1/32
=19+9+1/2+7+1/4+3+1/8+8+1/16+4+1/32
=19+9+7+3+8+4+1/2+1/4+1/8+1/16+1/32
=50+31/32=50又31/32
3.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3*1/4)
设)(1/2+1/3*1/4)=x,原式= (1+x)*(x+1/5)-(1+x+1/5)*x=1/5

等比数列1.1/1*2 +1/2*3 +1/3*4+...+1/99*100的值是多少? 习题1.1 1,2,3,4,5 题 1.1/1*2+1/2*3+1/3*4+……+1/99*100 2.2/1*3+2/3*5+2/5*7+……+2/97*99 找规律,--1.1/2,--1/3,1/4,--1/5,1/6 .第n个数是? 求最简单的整数比1.1/6:1/7:1/8 2,3/4:2/5:2/3 1.1/2>(1/2+1/4+...+1/2n)/n (n>=2)2.1/(n+1)(1+1/3+1/5+,+1/(2n-1))>1/n(1/2+1/4+,+1/2n) (n>=2) 15/2除以(1.1-4/3)+5/1乘以5/3,等于多少 30分悬赏,要算式!观察下面每一组算式,你发现它们各有什么规律呢?1.1/1×2=1/1-1/2 1/2×3=1/2-1/3 1/3×4=1/3-1/4……2.1/1+1/2=1+2/1×2 1/2+1/3=2+3/2×3 1/3+1/4=3+4/3×4……根据上面的规律,你能计算下面各题吗?1.1 1-2/1×(1+2)-3/(1+2)×(1+2+3)1.1-2/1×(1+2)-3/(1+2)×(1+2+3)-4/(1+2+3)×(1+2+3+4)-...-10/(1+2+...+9)×(1+2+...+10)怕大家看不懂,用文字形式说明.1减去1×(1+2)分之2,减去(1+2)×(1+2+3)分之3,减去(1+2+3)×(1+2+3+4)分之4...以此类 (1.1乘20.83减(12.8减8)乘1.1)除(3分之2加4分之1) 解不等式(组) 1.1/4x-1=-3(x+1)-1和1/2x-1(x-2)34.解不等式组(3-4x)/2 1.1x1.1-1x1.2,1.2x1.2-1.1x1.3,1.3x1.3-1.2x1.4这三道式有什么规律,你能 第九页习题1.1的1 2 3 1.1/1*2+1/2*3+1/3*4+……+1/n(n+1) 2.1/1*3+1/3*5+1/5*7+……+1/(2n-1)*(2n+1) 分式求和1.1+1/2+1/3+1/4+...+1/n1.1-1/2+1/3-1/4+1/5-1/6+...+1/(2n-1)-1/2n第二题当n趋于无穷时为0.7 1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/502.19+9又1/2+7又1/4+3又1/8+8又1/16+4又1/323.(1+1/2+1/3+1/4)*(1/2+1/31/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3*1/4) 使等式得1.1 2 3 4 5 6 7 8 =1 x=1,2,3,4,5 y=0.4,0.7,1.1,1.4,1.6