x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x

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x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x
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x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x
x^2+3y-3x
x^3+2x^2y-9x-18y
(y+2)x^2+(y+2)x-12y-24
m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2
x^2+3y-xy-3x

x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x
第一个不会,你没抄错题?
第二个是(x+2y)(x+3)(x-3);
第三个是(x+4)(x-3)(y+2);
第四个是(x+y)(x-y)(m+n)(m-n).