已知a=2,b=3,c=-2,A=3a^2b+3ab^2+b^4,B=a^2b+11ab^2+a^4,C=8ab^2+2a^2b+c^4求A+B-C

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已知a=2,b=3,c=-2,A=3a^2b+3ab^2+b^4,B=a^2b+11ab^2+a^4,C=8ab^2+2a^2b+c^4求A+B-C
已知a=2,b=3,c=-2,A=3a^2b+3ab^2+b^4,B=a^2b+11ab^2+a^4,C=8ab^2+2a^2b+c^4求A+B-C

已知a=2,b=3,c=-2,A=3a^2b+3ab^2+b^4,B=a^2b+11ab^2+a^4,C=8ab^2+2a^2b+c^4求A+B-C
∵a=2,b=3,c=-2
 ∵A=3a²b+3ab²+b^4
  B=a²b+11ab²+a^4
  C=8ab²+2a²b+c^4
 ∴A+B-C
  =3a²b+3ab²+b^4+(a²b+11ab²+a^4)-(8ab²+2a²b+c^4)
  =3a²b+3ab²+b^4+a²b+11ab²+a^4-8ab²-2a²b-c^4
  =2a²b+6ab²+b^4+a^4-c^4
  =2×2²×3+6×2×3²+3^4+2^4-(-2)^4
  =24+108+81+16-16
  =213

A+B-C
=2a^2b+6ab^2+a^4+b^4-c^4
=2a^2b+6ab^2+b^4
=24+108+81
=213