題目列表(包括答案和解析)
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| A．1個 | B．2個 | C．3個 | D．4個 |
,1,-
},有下列結論：①|a+b+c|=|a-b-c|;②(a+b+c)2=?a2+?b2+c2;③(a
b)c=a(b
c);④(a+b) 
c=a
(b-c).其中正確的結論的個數有（ ）A.4個 B.3個 C.2個 D.1個
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| A、1個 | B、2個 | C、3個 | D、4個 |
| A、②③ | B、③⑤ | C、③④ | D、③ |
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