问题
填空题
计算: ①-
②-
③
④
⑤-
⑥-
|
答案
①-
+(-1 2
)=-(1 3
+1 2
)1 3
=-
;5 6
②-
+1 2
=-(1 3
-1 2
)1 3
=-
;1 6
③
+1 2
=1 3
;5 6
④
-1 2
=1 3
+(-1 2
)1 3
=
;1 6
⑤-
-1 3
=-(1 4
+1 3
)1 4
=-
;7 12
⑥-
-(-1 4
)=-1 5
+1 4 1 5
=-(
-1 4
)1 5
=-
.1 20