已知x^a+b=14,y^a+b=18,求（-1/ - 知识问答

已知x^a+b=14,y^a+b=18,求（-1/63x^ay^b）^3×x^3b×y^3a的值

1个回答

（-1/63x^ay^b）^3×x^3b×y^3a
=-(1/63^3)×x^3ay^3b×x^3b×y^3a
=-(1/63^3)×x^(3a+3b)y^(3a+3b)
=-(1/63^3)×[x^(a+b)]^3×[y^(a+b)]^3
=-(1/63^3)×14^3×18^3
=-(1/63^3)×2^3×7^3×2^3×9^3
=-(1/63^3)×2^6×63^3
=-2^6
=-64

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