25(x-1)²=16(x-2)²怎么解?
问题描述:
25(x-1)²=16(x-2)²怎么解?
答
25(x-1)²=16(x-2)²
(5x-5)²=(4x-8)²
(5x-5)²-(4x-8)²=0
(5x-5+4x-8)(5x-5-4x+8)=0
(9x-13)(x+3)=0
x1=13/9 x2=-3