因式分解30题(初二級)(要过程)27分之1a^3+3分之1a^2+a+1 x^6-3x^4y+3x^2y^2-y^3 a^2-2ab+ac-2bc 2ax-10ay+5by-bx x^3-xyz+x^2y-x^2z 3x^2+15xy-yx-5y^2 a^3+3a^2+3a+9 15x+6xy-4y-10 4x^2-4xy+y^2-1 x^2-16y^2+x+4y x^3+3x^2-4x-12 a^4+2a^3+2a^2+1 (x^2

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