1.若a^2+a+1=0.求a^4+a^3-3a^2-4a+3的值2.2-2^2-2^3-.-2^18-2^19+2^203.(1)1-7/x+1=14/x^2-1 (2)2x/x-7+x-7/2x=24.b^2m+2除以(b^2除以b^2m)除以(b^2m)^25.(2xy)^3除以(6x^2y^3*1/3xy^-2)6.6x^n+1+5x^ny-4x^n-1y^24.b^(2m+2)÷(b^2÷b^2m)÷(b^2m)^25.(2xy)^
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![1.若a^2+a+1=0.求a^4+a^3-3a^2-4a+3的值2.2-2^2-2^3-.-2^18-2^19+2^203.(1)1-7/x+1=14/x^2-1 (2)2x/x-7+x-7/2x=24.b^2m+2除以(b^2除以b^2m)除以(b^2m)^25.(2xy)^3除以(6x^2y^3*1/3xy^-2)6.6x^n+1+5x^ny-4x^n-1y^24.b^(2m+2)÷(b^2÷b^2m)÷(b^2m)^25.(2xy)^](/uploads/image/z/399093-69-3.jpg?t=1.%E8%8B%A5a%5E2%2Ba%2B1%3D0.%E6%B1%82a%5E4%2Ba%5E3-3a%5E2-4a%2B3%E7%9A%84%E5%80%BC2.2-2%5E2-2%5E3-.-2%5E18-2%5E19%2B2%5E203.%281%291-7%2Fx%2B1%3D14%2Fx%5E2-1+%282%292x%2Fx-7%2Bx-7%2F2x%3D24.b%5E2m%2B2%E9%99%A4%E4%BB%A5%28b%5E2%E9%99%A4%E4%BB%A5b%5E2m%29%E9%99%A4%E4%BB%A5%28b%5E2m%29%5E25.%282xy%29%5E3%E9%99%A4%E4%BB%A5%286x%5E2y%5E3%2A1%2F3xy%5E-2%296.6x%5En%2B1%2B5x%5Eny-4x%5En-1y%5E24.b%5E%282m%2B2%29%C3%B7%28b%5E2%C3%B7b%5E2m%29%C3%B7%28b%5E2m%29%5E25.%282xy%29%5E)
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