问题
解答题
(1)5(x-2)2=245 (2)
|
答案
(1)方程变形得:(x-2)2=49,
开方得:x-2=7或x-2=-7,
解得:x1=9,x2=-5;
(2)原式=
+1 2
-2=1-2=-1.1 2
(1)5(x-2)2=245 (2)
|
(1)方程变形得:(x-2)2=49,
开方得:x-2=7或x-2=-7,
解得:x1=9,x2=-5;
(2)原式=
+1 2
-2=1-2=-1.1 2