计算:(3x-y)(x+2y)=________.
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计算:(x-3)(3x-4)=_________;
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计算:(3a-2)(2a+5)=________;
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计算:(a+2b)(a-b)=_________;
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填空:x2y·( )=2x3y-x2y2.
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已知ab2=-6,求-ab(a2b5-ab3-b)的值.
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N是一个单项式,且N·(-2x2y)=-3ax2y2,则N等于( ) A.ay B.-3ay C.-xy D.axy
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计算:0.125(a2+b2)3(a-b)2·16(-a2-b2)3(b-a)3.
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先化简,再求值:5x(x2-2x+4)-x2(5x-2)+(-4x)(2-2x),其中x=-.
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计算:3a(2a-5)+2a(1-3a).
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