(1)计算: 3 -8 - |1- 2 | +(1- 2 ) 0 ;(2)求x的值:4

(1)计算: 3 -8 - |1- 2 | +(1- 2 ) 0 ;(2)求x的值:4x 2 =49.
2025-02-23 12:17:19
推荐回答(1个)
回答1:

(1)原式=-2+1-
2
+1=-
2

(2)方程变形为x 2 =
49
4

开方得:x=±
7
2