因式分解法 25【X-1】平方-16=0
问题描述:
因式分解法 25【X-1】平方-16=0
答
(x-1)²=16/25
x-1=±4/5
x=1/5 x=9/5
答
25(x - 1)² - 16 = 0
(5x - 5 + 4)(5x - 5 - 4) = 0
(5x - 1)(5x - 9) = 0
x = 1/5 或 x = 9/5