已知x+y=a,求(2x+2y)³
问题描述:
已知x+y=a,求(2x+2y)³
答
(2x + 2y)³
= [2(x + y)]³
= (2a)³
= 8a³
已知x+y=a,求(2x+2y)³
(2x + 2y)³
= [2(x + y)]³
= (2a)³
= 8a³