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(3a²+2a-8)²-(a²-2a-8)² 因式分解 数学题
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人气:257 ℃ 时间:2019-10-19 15:29:26
解答
( 3a" + 2a - 8 )" - ( a" - 2a - 8 )"= [ ( 3a" + 2a - 8 ) + ( a" - 2a - 8 ) ][ ( 3a" + 2a - 8 ) - ( a" - 2a - 8 ) ]= ( 3a" + 2a - 8 + a" - 2a - 8 )( 3a" + 2a - 8 - a" + 2a + 8 )= ( 4a" - 16 )( 2a" + 4a...
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