问题
解答题
计算: (1)
(2)(
(3)
|
答案
(1)
×1 3
=75
=
×751 3
=5;25
(2)(
+5
)2-2
(5
+5
),2
=5+2
×5
+2-5-2
×5
,2
=
+2;10
或(
+5
)2-2
(5
+5
),2
=(
+5
)(2
+5
-2
),5
=
(2
+5
),2
=
+2;10
(3)
-6- 54 6
,24
=
-6
-29
,6
=-3-
.6