(6a+a²+9)(6a-a²-9)可以因式分解吗,
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(6a+a²+9)(6a-a²-9)可以因式分解吗,
(6a+a²+9)(6a-a²-9)可以因式分解吗,
(6a+a²+9)(6a-a²-9)可以因式分解吗,
( 6a + a" + 9 )( 6a - a" - 9 )
= -( a" - 6a + 9 )( a" + 6a + 9 )
= -( a - 3 )"( a + 3 )"
或者
= ( 3a + a" + 9 + 3a )( 3a - a" - 9 + 3a )
= [ a( 3 + a ) + 3( 3 + a ) ][ a( 3 - a ) - 3( 3 - a ) ]
= ( 3 + a )( 3 + a )( 3 - a )( a - 3 )
= -( 3 - a )"( 3 + a )"
完全平方,看清楚了吗?
=-(a²-9)⒋
(a+3)²-(a-3)²
=[(a+3)+(a-3)][(a+3)-(a-3)]
[6a+(a^2+9)][6a-(a^2+9)]