求 2x^2-xy-y^2-x-2y-1 因式分解RT 2x^2-xy-y^2-x-2y-1 因式分解 3Q

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求2x^2-xy-y^2-x-2y-1因式分解RT2x^2-xy-y^2-x-2y-1因式分解3Q求2x^2-xy-y^2-x-2y-1因式分解RT2x^2-xy-y^2-x-2y-1因式分解3Q求2

求 2x^2-xy-y^2-x-2y-1 因式分解RT 2x^2-xy-y^2-x-2y-1 因式分解 3Q
求 2x^2-xy-y^2-x-2y-1 因式分解
RT

2x^2-xy-y^2-x-2y-1 因式分解


3Q

求 2x^2-xy-y^2-x-2y-1 因式分解RT 2x^2-xy-y^2-x-2y-1 因式分解 3Q
2x^2-xy-y^2-x-2y-1
=(2x+y)(x-y)-(x+2y)-1
=(2x+y+1)(x-y-1)
2x+y 1
x-y -1