(1) (x+3)^2-(x-1)(x-2) (2)(a^2-1)除以(1-a分之1) (3)(x+y)^2-(x^3-y^3)除以(x+y)(4){3x^2(a^2+b^2)-3a^2b^2+3【x^2+(a+b)x+ab】*【x(x-a)-b(x-a)】}除以2x^ 其中x=2急需答案及解
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![(1) (x+3)^2-(x-1)(x-2) (2)(a^2-1)除以(1-a分之1) (3)(x+y)^2-(x^3-y^3)除以(x+y)(4){3x^2(a^2+b^2)-3a^2b^2+3【x^2+(a+b)x+ab】*【x(x-a)-b(x-a)】}除以2x^ 其中x=2急需答案及解](/uploads/image/z/6806849-41-9.jpg?t=%EF%BC%881%EF%BC%89+%EF%BC%88x%2B3%EF%BC%89%5E2-%EF%BC%88x-1%EF%BC%89%EF%BC%88x-2%EF%BC%89+%EF%BC%882%EF%BC%89%EF%BC%88a%5E2-1%EF%BC%89%E9%99%A4%E4%BB%A5%EF%BC%881-a%E5%88%86%E4%B9%8B1%EF%BC%89+%EF%BC%883%EF%BC%89%EF%BC%88x%2By%EF%BC%89%5E2-%EF%BC%88x%5E3-y%5E3%EF%BC%89%E9%99%A4%E4%BB%A5%28x%2By%EF%BC%89%EF%BC%884%EF%BC%89%7B3x%5E2%EF%BC%88a%5E2%2Bb%5E2%EF%BC%89-3a%5E2b%5E2%2B3%E3%80%90x%5E2%2B%EF%BC%88a%2Bb%EF%BC%89x%2Bab%E3%80%91%2A%E3%80%90x%EF%BC%88x-a%EF%BC%89-b%EF%BC%88x-a%EF%BC%89%E3%80%91%7D%E9%99%A4%E4%BB%A52x%5E++%E5%85%B6%E4%B8%ADx%3D2%E6%80%A5%E9%9C%80%E7%AD%94%E6%A1%88%E5%8F%8A%E8%A7%A3)
(1) (x+3)^2-(x-1)(x-2) (2)(a^2-1)除以(1-a分之1) (3)(x+y)^2-(x^3-y^3)除以(x+y)(4){3x^2(a^2+b^2)-3a^2b^2+3【x^2+(a+b)x+ab】*【x(x-a)-b(x-a)】}除以2x^ 其中x=2急需答案及解
(1) (x+3)^2-(x-1)(x-2) (2)(a^2-1)除以(1-a分之1) (3)(x+y)^2-(x^3-y^3)除以(x+y)
(4){3x^2(a^2+b^2)-3a^2b^2+3【x^2+(a+b)x+ab】*【x(x-a)-b(x-a)】}除以2x^ 其中x=2
急需答案及解题过程有知道的拜托告诉一下
拜托拜托,要不然明天就惨了 谢谢啊
(1) (x+3)^2-(x-1)(x-2) (2)(a^2-1)除以(1-a分之1) (3)(x+y)^2-(x^3-y^3)除以(x+y)(4){3x^2(a^2+b^2)-3a^2b^2+3【x^2+(a+b)x+ab】*【x(x-a)-b(x-a)】}除以2x^ 其中x=2急需答案及解
(1) (x+3)^2-(x-1)(x-2)
=x^2+6x+9-(x^2-3x+2)
=x^2+6x+9-x^2+3x-2
=x^2-x^2+6x+3x+9-2
=9x+7
(2)(a^2-1)÷(1-1/a)
=(a^2-1)÷(a-1)/a
=(a-1)(a+1)×a/(a-1)
=a(a+1)
=a^2+a
(3)(x+y)^2-(x^3-y^3)除以(x-y)
=(x+y)^2-(x-y)(x^2+xy+y^2)×1/(x-y)
=(x+y)^2-(x^2+xy+y^2)
=x^2+2xy+y^2-x^2-xy-y^2
=xy
{3x^2(a^2+b^2)-3a^2b^2+3[x^2+(a+b)x+ab]*[x(x-a)-b(x-a)]}除以2x^2
={3x^2(a^2+b^2)-3a^2b^2+3[(x+a)(x+b)]*[(x-b)(x-a)]}除以2x^2
={3x^2(a^2+b^2)-3a^2b^2+3[(x+a)(x-a)]*[(x-b)(x+b)]}除以2x^2
={3x^2(a^2+b^2)-3a^2b^2+3[(x^2-a^2)]*[(x^2-b^2)]}除以2x^2
={3x^2(a^2+b^2)-3a^2b^2+3[x^4-(a^2+b^2)x^2+a^2b^2]}除以2x^2
={3x^2(a^2+b^2)-3a^2b^2+3x^4-3(a^2+b^2)x^2+3a^2b^2]}除以2x^2
=3x^4除以2x^2
=3x^2/2
=3*2^2/2
=12/2
=6