(1)三次根号2x+1=三次根号5x+7 (2)三次根号2x-1=-三次根号5x+8
问题描述:
(1)三次根号2x+1=三次根号5x+7 (2)三次根号2x-1=-三次根号5x+8
答
三次根号2x+1=三次根号5x+7
2x+1=5x+7
5x-2x=1-7
3x=-6
x=-2
三次根号2x-1=-三次根号5x+8
2x-1=-5x-8
5x+2x=1-8
7x=-7
x=-1