若x为1/3的倒数,y为偶质数,求代数式(x-y)^5+3(x-y)^4+(x-y)^2-3的值.

问题描述:

若x为1/3的倒数,y为偶质数,求代数式(x-y)^5+3(x-y)^4+(x-y)^2-3的值.

解 X=3 Y=2
(x-y)^5+3(x-y)^4+(x-y)^2-3
=(3-2)^5+3(3-2)^4+(3-2)^2-3
=1+3+1-3
=2