问题
解答题
计算: (1)4
(2)2
(4)5
(3)(2
|
答案
(1)4
-46
+31 2
=48
-26
+62
=42
+46
;2
(2)2
×12
÷33 4
=42
×3
×3 4
=1 3 2
;2 2
(4)5
+1 5 1 2
-20 5 4
+4 5
=45
+5
-5
+35 2
=5
;9 5 2
(3)(2
+35
)2-(23
-35
)2=(23
+35
+23
-35
)(23
+35
-23
+35
)=243
.15