已知x等于4,y=负8分之1求7分之1xy^2*14[xy]^2*4分之1x^5的值

问题描述:

已知x等于4,y=负8分之1求7分之1xy^2*14[xy]^2*4分之1x^5的值

原式=(1/7×14×1/4)xy²*x²y²*x^5
=(1/2)x^8y^4
=(1/2)*4^8*(-1/8)^4
=(2^2)^8/[2*(2^3)^4]
=2^16/2^13
=2^3
=8