已知m,n满足│m+1│+(n-3)2=0,化简(x-m)(x-n)=_________.
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解方程:(x+3)(x-7)+8=(x+5)(x-1).
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若(mx+y)(x-y)=2x2+nxy-y2,求m,n的值.
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计算:
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计算:
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计算:
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计算:
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计算:
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计算:
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若(x+m)(x+n)=x2-6x+5,则( ) A.m, n同时为负 B.m,n同时为正; C.m,n异号 D.m,n异号且绝对值小的为正.
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