解方程(x²-2)+2x²(x+3)-3x-(5x-7)=x(3x²-9x+17)+2
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解方程(x²-2)+2x²(x+3)-3x-(5x-7)=x(3x²-9x+17)+2
急
x(x²-2)+2x²(x+3)-3x(5x-7)=x(3x²-9x+17)+2
急
x(x²-2)+2x²(x+3)-3x(5x-7)=x(3x²-9x+17)+2
![解方程(x²-2)+2x²(x+3)-3x-(5x-7)=x(3x²-9x+17)+2](/uploads/image/z/8818072-16-2.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%28x%26%23178%3B-2%29%2B2x%26%23178%3B%28x%2B3%29-3x-%285x-7%29%3Dx%283x%26%23178%3B-9x%2B17%29%2B2)
解
x(x²-2)+2x²(x+3)-3x(5x-7)=x(3x²-9x+17)+2
x³-2x+2x³+6x²-15x²+21x=3x³-9x²+17x+2
即
3x³-9x²+19x=3x³-9x²+17x+2
即19x-17x=2
∴2x=2
∴x=1
x(x²-2)+2x²(x+3)-3x(5x-7)=x(3x²-9x+17)+2
x³-2x+2x³+6x²-15x²+21x=3x³-9x²+17x+2
即
3x³-9x²+19x=3x³-9x²+17x+2
即19x-17x=2
∴2x=2
∴x=1
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