(3-x)²+x2=9 我算到了 “3-x+x=3,3=3”这是怎么搞的啊?
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![(3-x)²+x2=9 我算到了 “3-x+x=3,3=3”这是怎么搞的啊?](/uploads/image/z/7149499-43-9.jpg?t=%283-x%29%26%23178%3B%2Bx2%3D9+%E6%88%91%E7%AE%97%E5%88%B0%E4%BA%86+%E2%80%9C3-x%2Bx%3D3%2C3%3D3%E2%80%9D%E8%BF%99%E6%98%AF%E6%80%8E%E4%B9%88%E6%90%9E%E7%9A%84%E5%95%8A%3F)
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(3-x)²+x2=9 我算到了 “3-x+x=3,3=3”这是怎么搞的啊?
(3-x)²+x2=9 我算到了 “3-x+x=3,3=3”这是怎么搞的啊?
(3-x)²+x2=9 我算到了 “3-x+x=3,3=3”这是怎么搞的啊?
(3-x)²+x2=9
x²-6x+9+x²-9=0
2x²-6x=0
2x(x-3)=0
x=0或者x=3