问题
解答题
解方程、计算: (1)4x2=25 (2)(x-0.7)3=0.027 (3)
(4)
|
答案
(1)4x2=25,
x2=
,25 4
解得:x=±
;25 2
(2)(x-0.7)3=0.027,
x-0.7=0.3,
解得:x=1;
(3)
+(-6)2
-(3 27
)2,5
=6+3-5,
=4;
(4)
-3
+15 60 3 5
=
-33
+65 5 3
,5
=3
-35
,5
=0.