a_b c_d=a_(),括号中填什么?
人气：274 ℃ 时间：2020-04-22 10:12:57
解答
这应该用添括号法则：所添括号前为＋,括到括号里的每一项不变号；所添括号前为－,括到括号里的每一项都变号；所以：
-a+b-c+d=-a+(b-c+d )
-a+b-c+d=-(a-b+c )+d
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