若M=x²-2xy+y²,N=2x²-xy-3y²,则M+N=?
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若M=x²-2xy+y²,N=2x²-xy-3y²,则M+N=?
若M=x²-2xy+y²,N=2x²-xy-3y²,则M+N=?
若M=x²-2xy+y²,N=2x²-xy-3y²,则M+N=?
M+N=x²-2xy+y²+2x²-xy-3y²
=x²+2x²-2xy-xy+y²-3y²
=3x²-3xy-2y²
M+N=x²-2xy+y²+2x²-xy-3y²
=3x²-3xy-2y²
3x^2-3xy-2y^2