1、当m ____ 时,关于x的方程m²x² - mx+3=x+x²是一元二次方程.2、方程x²+4x+n=0有实数根,则n _____.3、分解因式:2x²-xy-2y²=______.4、若直角三角形以直角边为20cm,斜边上的高为10cm,那
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![1、当m ____ 时,关于x的方程m²x² - mx+3=x+x²是一元二次方程.2、方程x²+4x+n=0有实数根,则n _____.3、分解因式:2x²-xy-2y²=______.4、若直角三角形以直角边为20cm,斜边上的高为10cm,那](/uploads/image/z/14838237-45-7.jpg?t=1%E3%80%81%E5%BD%93m+____+%E6%97%B6%2C%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bm%26sup2%3Bx%26sup2%3B+-+mx%2B3%3Dx%2Bx%26sup2%3B%E6%98%AF%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B.2%E3%80%81%E6%96%B9%E7%A8%8Bx%26sup2%3B%2B4x%2Bn%3D0%E6%9C%89%E5%AE%9E%E6%95%B0%E6%A0%B9%2C%E5%88%99n+_____.3%E3%80%81%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%9A2x%26sup2%3B-xy-2y%26sup2%3B%3D______.4%E3%80%81%E8%8B%A5%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E4%BB%A5%E7%9B%B4%E8%A7%92%E8%BE%B9%E4%B8%BA20cm%2C%E6%96%9C%E8%BE%B9%E4%B8%8A%E7%9A%84%E9%AB%98%E4%B8%BA10cm%2C%E9%82%A3)
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