若a=2,b=-1,多项式2aチ0ナ5-4ab-3a-(aチ0ナ5+a-3ab)
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![若a=2,b=-1,多项式2aチ0ナ5-4ab-3a-(aチ0ナ5+a-3ab)](/uploads/image/z/13344794-26-4.jpg?t=%E8%8B%A5a%3D2%2Cb%3D-1%2C%E5%A4%9A%E9%A1%B9%E5%BC%8F2a%26%2365409%3B0%26%2365413%3B5-4ab-3a-%28a%26%2365409%3B0%26%2365413%3B5%2Ba-3ab%29)
若a=2,b=-1,多项式2aチ0ナ5-4ab-3a-(aチ0ナ5+a-3ab)
若a=2,b=-1,多项式2aチ0ナ5-4ab-3a-(aチ0ナ5+a-3ab)
若a=2,b=-1,多项式2aチ0ナ5-4ab-3a-(aチ0ナ5+a-3ab)
2a方-4ab-3a-(a方+a-3ab)
=2a方-4ab-3a-a方-a+3ab
=a方-ab-4a
=2方-2×(-1)-4×2
=4+2-8
=-2