已知(2m-1)²-25=0.求m的值
问题描述:
已知(2m-1)²-25=0.求m的值
答
(2m - 1)² - 25 = 0
(2m - 1)² = 25
2m - 1 = 5 或 2m - 1 = -5
n = 3 或 m = -2