能解几道就几道计算或者化简下列各式:(因技术问题 字母后面的2是指平方)1.(x2+2xy+y2)(x2-xy+y2)22.x2+3x+9\x2-27 + 6x\9x-x2 - x-1\6+2x分解因式:1.a7-ab62.ab(c2-d2)-(a2-b2)cd
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![能解几道就几道计算或者化简下列各式:(因技术问题 字母后面的2是指平方)1.(x2+2xy+y2)(x2-xy+y2)22.x2+3x+9\x2-27 + 6x\9x-x2 - x-1\6+2x分解因式:1.a7-ab62.ab(c2-d2)-(a2-b2)cd](/uploads/image/z/2613907-19-7.jpg?t=%E8%83%BD%E8%A7%A3%E5%87%A0%E9%81%93%E5%B0%B1%E5%87%A0%E9%81%93%E8%AE%A1%E7%AE%97%E6%88%96%E8%80%85%E5%8C%96%E7%AE%80%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%EF%BC%9A%28%E5%9B%A0%E6%8A%80%E6%9C%AF%E9%97%AE%E9%A2%98+%E5%AD%97%E6%AF%8D%E5%90%8E%E9%9D%A2%E7%9A%842%E6%98%AF%E6%8C%87%E5%B9%B3%E6%96%B9%291.%EF%BC%88x2%2B2xy%2By2%29%28x2-xy%2By2%2922.x2%2B3x%2B9%5Cx2-27+%2B+6x%5C9x-x2+-+x-1%5C6%2B2x%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%9A1.a7-ab62.ab%28c2-d2%29-%28a2-b2%29cd)
能解几道就几道计算或者化简下列各式:(因技术问题 字母后面的2是指平方)1.(x2+2xy+y2)(x2-xy+y2)22.x2+3x+9\x2-27 + 6x\9x-x2 - x-1\6+2x分解因式:1.a7-ab62.ab(c2-d2)-(a2-b2)cd
能解几道就几道
计算或者化简下列各式:(因技术问题 字母后面的2是指平方)
1.(x2+2xy+y2)(x2-xy+y2)2
2.x2+3x+9\x2-27 + 6x\9x-x2 - x-1\6+2x
分解因式:
1.a7-ab6
2.ab(c2-d2)-(a2-b2)cd
能解几道就几道计算或者化简下列各式:(因技术问题 字母后面的2是指平方)1.(x2+2xy+y2)(x2-xy+y2)22.x2+3x+9\x2-27 + 6x\9x-x2 - x-1\6+2x分解因式:1.a7-ab62.ab(c2-d2)-(a2-b2)cd
1.(x2+2xy+y2)(x2-xy+y2)2
=(x+y)^2(x2-xy+y2)2
=[(x+y)(x2-xy+y2)]^2
=(x^3+y^3)^2
1.a7-ab6
=a(a^6-b^6)
=a(a^3+b^3)(a^3-b^3)
2.ab(c2-d2)-(a2-b2)cd
=abc^2-abd^2-a^2cd+b^2cd
=ac(bc-ad)+bd(-ad+bc)
=(bc-ad)(ac+bd)