-10(x-25)平方-250=0
问题描述:
-10(x-25)平方-250=0
-10(x-25)平方+250=0
答
-10(x-25)^2+250=0
(x-25)^2 = 25
x-25 = 土5
x = 25土5
x1=30
x2=20