问题
解答题
计算.
5-
|
答案
(1)
+3 7
+5 8 4 7
=
+3 7
+4 7 5 8
=1+5 8
=1
;5 8
(2)
+1 5
+1 6 1 7
=
+11 30 1 7
=
;107 210
(3)1
-3 10
+3 10 4 13
=1+4 13
=1
;4 13
(4)5-
-4 7 3 7
=5-(
+4 7
)3 7
=5-1
=4;
(5)
+7 16
-3 5 7 16
=
-7 16
+7 16 3 5
=
;3 5
(6)
+5 7
-15 14
=
-115 14
=
.1 14