M=3x²-2xy+y² N=2x²+xy-3y² 求M-N M+N
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![M=3x²-2xy+y² N=2x²+xy-3y² 求M-N M+N](/uploads/image/z/2770382-38-2.jpg?t=M%3D3x%26%23178%3B-2xy%2By%26%23178%3B+N%3D2x%26%23178%3B%2Bxy-3y%26%23178%3B+%E6%B1%82M-N+M%2BN)
M=3x²-2xy+y² N=2x²+xy-3y² 求M-N M+N
M=3x²-2xy+y² N=2x²+xy-3y² 求M-N M+N
M=3x²-2xy+y² N=2x²+xy-3y² 求M-N M+N
M-N=(3x²-2xy+y² )-(2x²+xy-3y²)
=3x²-2xy+y²-2x²-xy+3y²
=x²-3xy+4y²
M+N=(3x²-2xy+y² )+(2x²+xy-3y²)
=3x²-2xy+y² +2x²+xy-3y²
=5x²-xy-2y²
M-N=x^2-3xy+4y^2
M+N=5x^2-xy-2y^2