(A-B-C)²=【A-( )】²=A²-( )+( )=A²+( )如题.

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(A-B-C)²=【A-()】²=A²-()+()=A²+()如题.(A-B-C)²=【A-()】²=A²-()+()=A

(A-B-C)²=【A-( )】²=A²-( )+( )=A²+( )如题.
(A-B-C)²=【A-( )】²=A²-( )+( )=A²+( )
如题.

(A-B-C)²=【A-( )】²=A²-( )+( )=A²+( )如题.
(A-B-C)²=【A-(B+C)】²=A²-(2A(B+C))+((B+C)²)=A²+(B²+C²+2BC-2AB-2AC)
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