7a^3-(6a^3-3a^3b)+3a^3+6a^3b-(3a^2b+10a)+3;{a=2,b=1/3}
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7a^3-(6a^3-3a^3b)+3a^3+6a^3b-(3a^2b+10a)+3;{a=2,b=1/3}
![7a^3-(6a^3-3a^3b)+3a^3+6a^3b-(3a^2b+10a)+3;{a=2,b=1/3}](/uploads/image/z/18968190-6-0.jpg?t=7a%5E3-%286a%5E3-3a%5E3b%29%2B3a%5E3%2B6a%5E3b-%283a%5E2b%2B10a%29%2B3%3B%7Ba%3D2%2Cb%3D1%2F3%7D)
7a^3-6a^3b+3a^2b+3a^3+6a^3b-3a^2b-10a^3+3 =(7a^3+3a^3-10a^3)+(-6a^3b+6a^3b)+(3a^2b-3a^2b)+3 =0+0+0+3 =3 所以a和b的值是多余的
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