问题
解答题
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答案
+b a-b+c
-2a+c b-a-c b-c b-a-c
=
+b a-b+c
=2a+c-b+c b-a-c
+-b b-a-c
=2a-b+2c b-a-c
=-2．2a-2b+2c b-a-c
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|
+b a-b+c
-2a+c b-a-c b-c b-a-c
=
+b a-b+c
=2a+c-b+c b-a-c
+-b b-a-c
=2a-b+2c b-a-c
=-2．2a-2b+2c b-a-c