问题
填空题
计算:
|
答案
原式=
,1+(
-1 3
)-(1 2
-1 4
)+(1 3
-1 5
)1 4 1-(
-1 3
)-(1 2
-1 4
)-(1 3
-1 5
)1 4
=
,1+
-1 3
+1 2
-1 4
+1 3
-1 5 1 4 1-
+1 3
-1 2
+1 4
-1 3
+1 5 1 4
=
,1-
+1 2 1 5 1+
-1 2 1 5
=
,7 10 13 10
=
.7 13