(6a+a²+9)(6a-a²-9)可以因式分解吗,
问题描述:
(6a+a²+9)(6a-a²-9)可以因式分解吗,
答
( 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 )(...