1.先化简,再求值:{2x^2-(x+y)(x-y)}{(-x-y)(-x+y)+2y^2,其中,x=-1,y=-22.已知:13x^2-6xy+y^2-4x+1=0.求(x+y)^13×x^10的值以便我理解!)
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![1.先化简,再求值:{2x^2-(x+y)(x-y)}{(-x-y)(-x+y)+2y^2,其中,x=-1,y=-22.已知:13x^2-6xy+y^2-4x+1=0.求(x+y)^13×x^10的值以便我理解!)](/uploads/image/z/5928134-14-4.jpg?t=1.%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%3A%7B2x%5E2-%28x%2By%29%28x-y%29%7D%7B%28-x-y%29%28-x%2By%29%2B2y%5E2%2C%E5%85%B6%E4%B8%AD%2Cx%3D-1%2Cy%3D-22.%E5%B7%B2%E7%9F%A5%3A13x%5E2-6xy%2By%5E2-4x%2B1%3D0.%E6%B1%82%EF%BC%88x%2By%29%5E13%C3%97x%5E10%E7%9A%84%E5%80%BC%E4%BB%A5%E4%BE%BF%E6%88%91%E7%90%86%E8%A7%A3%21%EF%BC%89)
1.先化简,再求值:{2x^2-(x+y)(x-y)}{(-x-y)(-x+y)+2y^2,其中,x=-1,y=-22.已知:13x^2-6xy+y^2-4x+1=0.求(x+y)^13×x^10的值以便我理解!)
1.先化简,再求值:
{2x^2-(x+y)(x-y)}{(-x-y)(-x+y)+2y^2,其中,x=-1,y=-2
2.已知:13x^2-6xy+y^2-4x+1=0.求(x+y)^13×x^10的值
以便我理解!)
1.先化简,再求值:{2x^2-(x+y)(x-y)}{(-x-y)(-x+y)+2y^2,其中,x=-1,y=-22.已知:13x^2-6xy+y^2-4x+1=0.求(x+y)^13×x^10的值以便我理解!)
{2x^2-(x+y)(x-y)}{(-x-y)(-x+y)+2y^2}
=(2x"-x"+y")(x"-y"+2y")
=(x"+y")"
=(1+4)"
=25
13x^2-6xy+y^2-4x+1=0
4x"-4x+1+9x"-6xy+y"=0
(2x-1)"+(3x-y)"=0
x=1/2,y=3x=3/2
(x+y)^13×x^10
=2^13×(1/2)^10
=2"'
=8
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