1、试判断当x为何正整数时,代数式x^4+x^2+1的值是质数2、分解因式:(1)x^3+4x^2-x-4 (2)x(x-1)(x+1)(x+2)+13、已知a,b,c是三角形ABC的三边,判断(a^2+b^2-c^2)^2-4a^2b^2的值是大于零、小于零还是等于零?为什
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![1、试判断当x为何正整数时,代数式x^4+x^2+1的值是质数2、分解因式:(1)x^3+4x^2-x-4 (2)x(x-1)(x+1)(x+2)+13、已知a,b,c是三角形ABC的三边,判断(a^2+b^2-c^2)^2-4a^2b^2的值是大于零、小于零还是等于零?为什](/uploads/image/z/6701253-69-3.jpg?t=1%E3%80%81%E8%AF%95%E5%88%A4%E6%96%AD%E5%BD%93x%E4%B8%BA%E4%BD%95%E6%AD%A3%E6%95%B4%E6%95%B0%E6%97%B6%2C%E4%BB%A3%E6%95%B0%E5%BC%8Fx%5E4%2Bx%5E2%2B1%E7%9A%84%E5%80%BC%E6%98%AF%E8%B4%A8%E6%95%B02%E3%80%81%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%9A%281%29x%5E3%2B4x%5E2-x-4+%282%29x%28x-1%29%28x%2B1%29%28x%2B2%29%2B13%E3%80%81%E5%B7%B2%E7%9F%A5a%2Cb%2Cc%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%89%E8%BE%B9%2C%E5%88%A4%E6%96%AD%EF%BC%88a%5E2%2Bb%5E2-c%5E2%EF%BC%89%5E2-4a%5E2b%5E2%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%A7%E4%BA%8E%E9%9B%B6%E3%80%81%E5%B0%8F%E4%BA%8E%E9%9B%B6%E8%BF%98%E6%98%AF%E7%AD%89%E4%BA%8E%E9%9B%B6%3F%E4%B8%BA%E4%BB%80)
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