(2x-3)(2x+1)+3(2x-1)(-2x-1)
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(2x-3)(2x+1)+3(2x-1)(-2x-1)
(a+b)(a+b-6)=9
(a+b)(a+b-6)=9
![(2x-3)(2x+1)+3(2x-1)(-2x-1)](/uploads/image/z/3414625-25-5.jpg?t=%282x-3%29%282x%2B1%29%2B3%282x-1%29%28-2x-1%29)
(1)=4x方-4x-3+3(1-4x方)
=4x方-4x-3+3-12x方
=-8x方-4x(多项式计算结果)
=-4x(2x+1)(因式分解结果)
(2)(a+b)方-6(a+b)=9
(a+b)方-6(a+b)-9=0
(a+b)方-6(a+b)+9-18=0
(a+b-3)方=18
a+b-3=±根号18
a+b=3±根号18
要采纳哦,祝你考试成功!
=4x方-4x-3+3-12x方
=-8x方-4x(多项式计算结果)
=-4x(2x+1)(因式分解结果)
(2)(a+b)方-6(a+b)=9
(a+b)方-6(a+b)-9=0
(a+b)方-6(a+b)+9-18=0
(a+b-3)方=18
a+b-3=±根号18
a+b=3±根号18
要采纳哦,祝你考试成功!
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