已知M=3x²+2x-1,N=-x²-2+3x,求M-2N,并求当x= -1时,M-2N的值
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已知M=3x²+2x-1,N=-x²-2+3x,求M-2N,并求当x= -1时,M-2N的值
已知M=3x²+2x-1,N=-x²-2+3x,求M-2N,并求当x= -1时,M-2N的值
已知M=3x²+2x-1,N=-x²-2+3x,求M-2N,并求当x= -1时,M-2N的值
M=3x²+2x-1,
N=-x²-2+3x
M-2N=3x²+2x-1+2x²+4-6x
=5x²-4x+3
当x=-1时
M-2N=5+4+3=12