问题
解答题
计算: (1)|
(2)
(3)若
|
答案
(1)原式=
-5
+2 2
=
;5
(2)原式=
+3 - 64 125
-36 25 16
=-
+4 5
-46 5
=-3
;3 5
(3)由题意得
,m-4=0 n+2=0
解得m=4,n=-2;
mn=4×(-2)=-8;
∴mn的立方根为-2.
计算: (1)|
(2)
(3)若
|
(1)原式=
-5
+2 2
=
;5
(2)原式=
+3 - 64 125
-36 25 16
=-
+4 5
-46 5
=-3
;3 5
(3)由题意得
,m-4=0 n+2=0
解得m=4,n=-2;
mn=4×(-2)=-8;
∴mn的立方根为-2.