(1)若x的3n次方=4,y的3n次方=5.求(x的2n次方)的立方+(y的n次方)的立方-x的2n次方×
问题描述:
(1)若x的3n次方=4,y的3n次方=5.求(x的2n次方)的立方+(y的n次方)的立方-x的2n次方×
(1)若x的3n次方=4,y的3n次方=5.
求(x的2n次方)的立方+(y的n次方)的立方-x的2n次方×y的n次方×x的4n次方×y的2n次方的值.
答
(x的2n次方)的立方+(y的n次方)的立方-x的2n次方×y的n次方×x的4n次方×y的2n次方
=(x的3n次方)的平方+y的3n次方-x的6n次方xy的3n次方
=(x的3n次方)的平方+y的3n次方-(x的3n次方)的平方x(y的3n次方)
=4的平方+5-4的平方x5
=16+5-80
=-59