已知x^a+b=14,y^a+b=18,求(-1/63x^ay^b)^3×x^3b×y^3a的值
问题描述:
已知x^a+b=14,y^a+b=18,求(-1/63x^ay^b)^3×x^3b×y^3a的值
我会迅速采纳、
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