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
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
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解:∵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=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
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