(-9a^2b^2c)^2÷(3ab^2)=
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(-9a^2b^2c)^2÷(3ab^2)=(-9a^2b^2c)^2÷(3ab^2)=(-9a^2b^2c)^2÷(3ab^2)=(-9a^2b^2c)^2÷(3ab^2)=81a^4b^4c^2÷
(-9a^2b^2c)^2÷(3ab^2)=
(-9a^2b^2c)^2÷(3ab^2)=
(-9a^2b^2c)^2÷(3ab^2)=
(-9a^2b^2c)^2÷(3ab^2)
=81a^4 b^4 c^2÷(3ab^2)
=27a^3 b^2 c^2
b/(a^2-ab)+c/(b^2-ab)+(a+b^2)/(a^2b-ab^2)
2(a^2b-2ab^2+c)-(2c+3a^2b-ab^2)
2(a²b-2ab²+c)-(2c+3a²b-ab²)
(a+b+c)(a^2+b^2+c^2-ab-ac-bc)+3ab=
若a>b>c,a+2b+3c=0,ab>ac与ab
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