多项式8xy-x^2+y^2与多项式M的差为-2x^2+2y^2,M=?
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多项式8xy-x^2+y^2与多项式M的差为-2x^2+2y^2,M=?
多项式8xy-x^2+y^2与多项式M的差为-2x^2+2y^2,M=?
多项式8xy-x^2+y^2与多项式M的差为-2x^2+2y^2,M=?
多项式8xy-x^2+y^2与多项式M的差为-2x^2+2y^2,
M=8xy-x^2+y^2 -(-2x^2+2y^2)
=8xy-x^2+y^2+2x^2-2y^2
=x^2+8xy-y^2
多项式8xy-x^2+y^2与多项式M的差为-2x^2+2y^2,
M=8xy-x^2+y^2+(-2x^2+2y^2)
=8xy-x^2+y^2-2x^2+2y^2
=-3x^2+8xy+3y^2