1/2=1/3+1/6;1/3=1/4+1/12;1/4=1/5+1/201/n=1/a+1/b,a+b=
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1/2=1/3+1/6;1/3=1/4+1/12;1/4=1/5+1/201/n=1/a+1/b,a+b=1/2=1/3+1/6;1/3=1/4+1/12;1/4=1/5+1/201/n=1/a+1/
1/2=1/3+1/6;1/3=1/4+1/12;1/4=1/5+1/201/n=1/a+1/b,a+b=
1/2=1/3+1/6;1/3=1/4+1/12;1/4=1/5+1/201/n=1/a+1/b,a+b=
1/2=1/3+1/6;1/3=1/4+1/12;1/4=1/5+1/201/n=1/a+1/b,a+b=
1/n=1/a+1/b,a=n+1,b=n(n+1),a+b=n+1+n(n+1)=(n+1)的平方
a+b=(n+1)+n(n+1)=(n+1)^2
由题意可知
a+b=a^2 na=b
∵na=b
∴a+na=a^2
(n+1)a=a^2
∴a=n+1
∴a+b=a^2=(n+1)^2
1+2+3/6+1/4=
巧算：(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=====
1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=?
1/1*3+1/2*4+1/3*5+1/4*6+.+1/100*102=?
1-1/2+1/3-1/4+1/5-1/6+…+1/15=23*[1/( )+1/( )+1/( )+1/( )]
1/2+1/3+1/4+1/5+1/6+1/7+.1/20=
6/1{4/1[3/1(2/1x-1)+3]+5}=1 解方程
1/6【1/4{1/3（1/2X-1）+3}+5】=1
1/2{1/3[1/4(1/5x-1)-6+3}=1 解方程
1/2{1/3[1/4(5/1x-1)-6]+3}=1
(-3/4)+(-1/6)-(-1右-1/2)=多少?
1/4-1/5=1/18+1/6=1/2-1/8=7/11+5=1/3+1/4=2-1/3=
1/2{1/3[1/4(1/5x-1)-6]+4}=1
1.（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）=2.（1+1/2+1/3+1/4+1/5）*（1/2+1/3+1/4+1/5+1/6）-（1+1/2+1/3+1/4+1/5+1/6）*（1/2+1/3+1/4+1/5）=
2×3/1+3×4/1+4×5/1+5×6/1+.199×200/1=?
1/2+1/3+1/4=?
1/2-3/1-4/1=
因为1-2/1=2/1,2/1-3/1=6/1,3/1-4/1=12/1,所以2/1+6/1=1-2/1+2/1-3/1=1-3/1=3/2 2/1+6/1+12/1=1-2/1+2/1-3/1+3/1-4/1=1-4/1=4/3