问题
解答题
1
|
答案
1
×1 2
-(-5 7
)×25 7
+(-1 2
)×5 2
,5 7
=1
×1 2
+5 7
×25 7
+(-1 2
)×5 2
,5 7
=
×(15 7
+21 2
-1 2
),5 2
=
×5 7
,3 2
=
.15 14
1
|
1
×1 2
-(-5 7
)×25 7
+(-1 2
)×5 2
,5 7
=1
×1 2
+5 7
×25 7
+(-1 2
)×5 2
,5 7
=
×(15 7
+21 2
-1 2
),5 2
=
×5 7
,3 2
=
.15 14