问题
解答题
计算: (1)5
(2)
(3)
(4)(
|
答案
(1)原式=5
+22
-212
=-182
;2
(2)原式=2
+3
-3 9
=3 3
;16 3 9
(3)原式=2
+ 3x
-2x
=3x
;x
(4)原式=4-2
-(3-2)=3-23
.3
计算: (1)5
(2)
(3)
(4)(
|
(1)原式=5
+22
-212
=-182
;2
(2)原式=2
+3
-3 9
=3 3
;16 3 9
(3)原式=2
+ 3x
-2x
=3x
;x
(4)原式=4-2
-(3-2)=3-23
.3