问题
填空题
计算:(
|
答案
(
-4 3
+15 36
-9 20
)-7 12
+11 30 13 42
=
-(4 3
+1 12
)+(1 3
+1 4
)-(1 5
+1 4
)-(1 3
+1 5
)+(1 6
+1 7
),1 6
=
-4 3
-1 12
+1 3
+1 4
-1 5
-1 4
-1 3
-1 5
+1 6
+1 7
,1 6
=
-4 3
-1 3
+(1 3
-1 4
)+(1 4
-1 5
)+(1 5
-1 6
)-1 6
+1 12
,1 7
=
-2 3
+1 12
,1 7
=
.61 84
故答案为:
.61 84