问题
解答题
计算 (1)
(2)
(3)
(4)
|
答案
(1)
-27
+12 45
=3
-23
+33 5
=
+33
; 5
(2)
÷5 3
+10 9
×1 7 63
=
+33 2
=3+1 2
;6
(3)
+(2
-13
-1)23
=
+1+3-23
+13
=5-
;3
(4)
+(8 2
-10
)0-5 2 2
=
+1-2 2
=1.