a^2-2ab-3b^2+12b-9因式分解
2015-04-30 · 知道合伙人教育行家
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a^2-2ab-3b^2+12b-9
=a^2-2ab+b^2-4b^2+12b-9
=(a-b)^2-(4b^2-12b+9)
=(a-b)^2-(2b-3)^2
=[(a-b)+(2b-3)][(a-b)-(2b-3)
=(a+b-3)(a-3b+3)
=a^2-2ab+b^2-4b^2+12b-9
=(a-b)^2-(4b^2-12b+9)
=(a-b)^2-(2b-3)^2
=[(a-b)+(2b-3)][(a-b)-(2b-3)
=(a+b-3)(a-3b+3)
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a” - 2ab - 3b” + 12b - 9
= a” - 2ab + b” - 4b” + 12b - 9
= ( a” - 2ab + b” ) - [ (2b)” - 3(4b) + 3” ]
= ( a - b )” - ( 2b - 3 )”
= [ (a - b) - (2b - 3) ][ (a - b) + (2b - 3) ]
= ( a - b - 2b + 3 )( a - b + 2b - 3 )
= ( a - 3b + 3 )( a + b - 3 )
= a” - 2ab + b” - 4b” + 12b - 9
= ( a” - 2ab + b” ) - [ (2b)” - 3(4b) + 3” ]
= ( a - b )” - ( 2b - 3 )”
= [ (a - b) - (2b - 3) ][ (a - b) + (2b - 3) ]
= ( a - b - 2b + 3 )( a - b + 2b - 3 )
= ( a - 3b + 3 )( a + b - 3 )
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