化简1/1*2=1-1/2,1/2*3=1/2-1/3,1/3*4=1/3-1/4则1/(x-1)x+1/x(x+1)+1/(x+1)(x+2)+..+1/(x+9)(x+10)=
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化简1/1*2=1-1/2,1/2*3=1/2-1/3,1/3*4=1/3-1/4则1/(x-1)x+1/x(x+1)+1/(x+1)(x+2)+..+1/(x+9)(x+10)=化简1/1*2=1-
化简1/1*2=1-1/2,1/2*3=1/2-1/3,1/3*4=1/3-1/4则1/(x-1)x+1/x(x+1)+1/(x+1)(x+2)+..+1/(x+9)(x+10)=
化简1/1*2=1-1/2,1/2*3=1/2-1/3,1/3*4=1/3-1/4则1/(x-1)x+1/x(x+1)+1/(x+1)(x+2)+..+1/(x+9)(x+10)=
化简1/1*2=1-1/2,1/2*3=1/2-1/3,1/3*4=1/3-1/4则1/(x-1)x+1/x(x+1)+1/(x+1)(x+2)+..+1/(x+9)(x+10)=
原式=1/（x-1）-1/x+1/x-1/(x-2)+1/(x-2)-,+1/(x+9)-1/(x+10) =1/(x-1)-1/(x+10) 分解开来后除了首尾两项之外全都消去了,可得结果
-1/2(-2)^n-1=化简
化简√3-2分之1=
1/3：1/2化简
化简1/3:1/2
化简：(1-2a)^2-2(1-2a)=
化简：(x+1)^2-2x=?
化简1*2分子1+2*3分之1+3*4分之1+n(n+1)分之1=
化简f(x)=(sinx)^2-3^1/2sinxcosx
化简,求值(2a+1)^2-2(2a+1)+3,其中a=根号2
化简:(2-1)(2+1)(22+1)(24+1)…(216+1)+1=
(m-2n-1)(m-2n-1)=?化简
M-2分之|M-2|=1,化简|1-M|
化简y=a×2^x-1-a／2^-1
(-1/2)ln(1-2y)=ln(xc)化简
化简：√2-1分之1+√3+1分之2=
已知1-1/2=1/2,1/2-1/3=1/6,1/3-1/4=1/12,...根据这些等式解答下列各题.(1)求值:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6(2)化简:1/1*2+1/2*3+1/3*4+...+1/n(n+1)(3)若1/1*2+1/2*3+1/3*4+...+1/n(n+1)=19/20,则n=?
y=(1+cotx)sinx^2化简
化简：1-2sin2 15度=