问题
选择题
方程-2
|
答案
-2
[-21 2
(2 5
-5x 6
)-22 3
]+31 5
=45 7
,3 14
-
[-5 2
(12 5
-x 6
)-17 3
]+11 5
=26 7
,59 14
6(
-x 6
)+17 3
+11 2
=26 7
,59 14
x-34+
+11 2
=26 7
,59 14
14x-476+77+52=59,
14x=59+476-77-52,
14x=406,
x=29.
故选B.