a²-2a(b+c)+(b+c)²分解因式
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a” - 2a( b + c ) + ( b + c )”
= [ a - ( b + c ) ]”
= ( a - b - c )”
或者
= a" - a( b + c ) - a( b + c )+ ( b + c )"
= a[ a - ( b + c ) ] - ( b + c )[ a - ( b + c ) ]
= [ a - ( b + c ) ][ a - ( b + c ) ]
= ( a - b - c )( a - b - c )
= ( a - b - c )”
= [ a - ( b + c ) ]”
= ( a - b - c )”
或者
= a" - a( b + c ) - a( b + c )+ ( b + c )"
= a[ a - ( b + c ) ] - ( b + c )[ a - ( b + c ) ]
= [ a - ( b + c ) ][ a - ( b + c ) ]
= ( a - b - c )( a - b - c )
= ( a - b - c )”
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