(-x^2n)(-x)^n=8^n,求2x^2+x-15/4x-10

问题描述:

(-x^2n)(-x)^n=8^n,求2x^2+x-15/4x-10

(-x^2n)(-x)^n=8^n
x^3n=2^3n
x=2
2x^2+x-15/4x-10
=(2*2²+2-15)/(4*2-10)
=-5/(-2)
=2.5