若|x|=7,若|x|=0 则x= 5-3x²+5x-(2x²-3x) (X²-3x+1)
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若|x|=7,若|x|=0 则x= 5-3x²+5x-(2x²-3x) (X²-3x+1)(三分之二x²-5x-3)
![若|x|=7,若|x|=0 则x= 5-3x²+5x-(2x²-3x) (X²-3x+1)](/uploads/image/z/19421091-27-1.jpg?t=%E8%8B%A5%7Cx%7C%3D7%2C%E8%8B%A5%7Cx%7C%3D0+%E5%88%99x%3D+5-3x%26%23178%3B%EF%BC%8B5x-%EF%BC%882x%26%23178%3B-3x%EF%BC%89+%EF%BC%88X%26%23178%3B-3x%EF%BC%8B1%EF%BC%89)
|x|=7
x=±7
|x|=0
x=0
5-3x²+5x-(2x²-3x)=5-3x²+5x-2x²+3x=-5x²+8x+5
(X²-3x+1)(三分之二x²-5x-3)=(x²-3x+1)(2/3x²-5x-3)=2/3x^4-5x^3-3x²-2x^3+15x²+9x+2/3x²-5x-3=2/3x^4-7x^3+38/3x²+4x-3
x=±7
|x|=0
x=0
5-3x²+5x-(2x²-3x)=5-3x²+5x-2x²+3x=-5x²+8x+5
(X²-3x+1)(三分之二x²-5x-3)=(x²-3x+1)(2/3x²-5x-3)=2/3x^4-5x^3-3x²-2x^3+15x²+9x+2/3x²-5x-3=2/3x^4-7x^3+38/3x²+4x-3
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