1、已知x²+x-1等于0,求x³+2x²+2008的值 2、(1-1/2²)(1-1/3²)(1-1/4²)···(1-1/10²) 3、有理数x,y满足(x-y)²+x²+2x+1=0,则(xy)的2009次方等于?x²+x-2=0,x
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![1、已知x²+x-1等于0,求x³+2x²+2008的值 2、(1-1/2²)(1-1/3²)(1-1/4²)···(1-1/10²) 3、有理数x,y满足(x-y)²+x²+2x+1=0,则(xy)的2009次方等于?x²+x-2=0,x](/uploads/image/z/14330264-32-4.jpg?t=1%E3%80%81%E5%B7%B2%E7%9F%A5x%26%23178%3B%2Bx-1%E7%AD%89%E4%BA%8E0%2C%E6%B1%82x%26%23179%3B%2B2x%26%23178%3B%2B2008%E7%9A%84%E5%80%BC+2%E3%80%81%EF%BC%881-1%2F2%26%23178%3B%EF%BC%89%EF%BC%881-1%2F3%26%23178%3B%EF%BC%89%EF%BC%881-1%2F4%26%23178%3B%EF%BC%89%C2%B7%C2%B7%C2%B7%EF%BC%881-1%2F10%26%23178%3B%EF%BC%89+3%E3%80%81%E6%9C%89%E7%90%86%E6%95%B0x%2Cy%E6%BB%A1%E8%B6%B3%EF%BC%88x-y%EF%BC%89%26%23178%3B%EF%BC%8Bx%26%23178%3B%EF%BC%8B2x%EF%BC%8B1%EF%BC%9D0%2C%E5%88%99%EF%BC%88xy%EF%BC%89%E7%9A%842009%E6%AC%A1%E6%96%B9%E7%AD%89%E4%BA%8E%3Fx%26%23178%3B%2Bx-2%3D0%2Cx%26%231)
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1、已知x²+x-1等于0,求x³+2x²+2008的值 2、(1-1/2²)(1-1/3²)(1-1/4²)···(1-1/10²) 3、有理数x,y满足(x-y)²+x²+2x+1=0,则(xy)的2009次方等于?x²+x-2=0,x
1、已知x²+x-1等于0,求x³+2x²+2008的值 2、(1-1/2²)(1-1/3²)(1-1/4²)···(1-1/10²) 3、有理数x,y满足(x-y)²+x²+2x+1=0,则(xy)的2009次方等于?
x²+x-2=0,x³+2x²-x+2007等于啥?2009,-2009,2008,-2008?
1、已知x²+x-1等于0,求x³+2x²+2008的值 2、(1-1/2²)(1-1/3²)(1-1/4²)···(1-1/10²) 3、有理数x,y满足(x-y)²+x²+2x+1=0,则(xy)的2009次方等于?x²+x-2=0,x
这是一道类似的题,你可以先看看,解题方法都一样,
其他的题你自己去我截图的网站上搜吧,基本上都有的.
加号为Λ 平方为* (1)原式=X(X*ΛX-1)ΛX*ΛX-1Λ2009=2009 (2)原式=(1Λ1/2)(1-1/2)(1-1/3)(1Λ1/3)~~~~(1-1/10)(1Λ1/10)=1/2x3/2x2/3x4/3x3/4x5/4~~~~~9/10x11/10=11/20 (3)(xΛy)*Λ(xΛ1)*=0 所以x=y =-1 所以xy=1