已知x=4,y=1/8,求代数式:1/7xy^2*14(xy)^2*1/4x^5的值

问题描述:

已知x=4,y=1/8,求代数式:1/7xy^2*14(xy)^2*1/4x^5的值

1/7xy^2*14(xy)^2*1/4x^5
=1/2x^8y^4
=1/2*4^8*(1/8)^4
=1/2*16^4*(1/8)^4
=1/2*(16*1/8)^4
=1/2*2^4
=2^3
=8