已知A=5a+3b,B=3a²-2a²b,C=a²+7a²b-2,求A-2B+3
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已知A=5a+3b,B=3a²-2a²b,C=a²+7a²b-2,求A-2B+3C的值
![已知A=5a+3b,B=3a²-2a²b,C=a²+7a²b-2,求A-2B+3](/uploads/image/z/278422-70-2.jpg?t=%E5%B7%B2%E7%9F%A5A%3D5a%2B3b%2CB%3D3a%26%23178%3B-2a%26%23178%3Bb%2CC%3Da%26%23178%3B%2B7a%26%23178%3Bb-2%2C%E6%B1%82A-2B%2B3)
A-2B+3C=5a+3b-2*(3a^2-2a^2b)+3(a^2+7a^2b-2)
=5a+3b-6a^2+4a^2b+3a^2+21a^2b-6
=5a+3b-3a^2+25a^2b-6
=5a+3b-6a^2+4a^2b+3a^2+21a^2b-6
=5a+3b-3a^2+25a^2b-6
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