因式分解法解下列方程 1、用因式分解法解下列方程:(1)3y^2-5y=0 (2)4x^2=12x (3)x^2+9=-6x (4)9x^2=(x-x^3-3x^2-13x+15 =x^3-3x^2+2x-15x+15 =x(x^2-3x+2)-15(x-1) =x(x-2)(x-1)-15(x-1) =(x-1)[x(x-2)-15] =(x-1)[x^2-2x-15] =(x-1)(x-5)(x+
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![因式分解法解下列方程 1、用因式分解法解下列方程:(1)3y^2-5y=0 (2)4x^2=12x (3)x^2+9=-6x (4)9x^2=(x-x^3-3x^2-13x+15 =x^3-3x^2+2x-15x+15 =x(x^2-3x+2)-15(x-1) =x(x-2)(x-1)-15(x-1) =(x-1)[x(x-2)-15] =(x-1)[x^2-2x-15] =(x-1)(x-5)(x+](/uploads/image/z/591751-55-1.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B+1%E3%80%81%E7%94%A8%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%3A%281%293y%5E2-5y%3D0+%EF%BC%882%EF%BC%894x%5E2%3D12x+%283%29x%5E2%2B9%3D-6x+%284%299x%5E2%3D%28x-x%5E3-3x%5E2-13x%2B15+%3Dx%5E3-3x%5E2%2B2x-15x%2B15+%3Dx%28x%5E2-3x%2B2%29-15%28x-1%29+%3Dx%28x-2%29%28x-1%29-15%28x-1%29+%3D%28x-1%29%5Bx%28x-2%29-15%5D+%3D%28x-1%29%5Bx%5E2-2x-15%5D+%3D%28x-1%29%28x-5%29%28x%2B)
因式分解法解下列方程 1、用因式分解法解下列方程:(1)3y^2-5y=0 (2)4x^2=12x (3)x^2+9=-6x (4)9x^2=(x-x^3-3x^2-13x+15 =x^3-3x^2+2x-15x+15 =x(x^2-3x+2)-15(x-1) =x(x-2)(x-1)-15(x-1) =(x-1)[x(x-2)-15] =(x-1)[x^2-2x-15] =(x-1)(x-5)(x+
因式分解法解下列方程 1、用因式分解法解下列方程:(1)3y^2-5y=0 (2)4x^2=12x (3)x^2+9=-6x (4)9x^2=(x-
x^3-3x^2-13x+15
=x^3-3x^2+2x-15x+15
=x(x^2-3x+2)-15(x-1)
=x(x-2)(x-1)-15(x-1)
=(x-1)[x(x-2)-15]
=(x-1)[x^2-2x-15]
=(x-1)(x-5)(x+3) 这样的
因式分解法解下列方程 1、用因式分解法解下列方程:(1)3y^2-5y=0 (2)4x^2=12x (3)x^2+9=-6x (4)9x^2=(x-x^3-3x^2-13x+15 =x^3-3x^2+2x-15x+15 =x(x^2-3x+2)-15(x-1) =x(x-2)(x-1)-15(x-1) =(x-1)[x(x-2)-15] =(x-1)[x^2-2x-15] =(x-1)(x-5)(x+
(1)3y^2-5y=0
3y^2-5y=y(3y-5)=0,则y=0或y=5/3
(2)4x^2=12x
变形为4x^2-12x =0即4x(x-3)=0则x=0或x=3
(3)x^2+9=-6x
变形为x^2+6x+9=0即(x+3)²=0则x=-3
4题不全
1、y(3y-5)=0
y=0, y=5/3
2、4x^2-12x=0
4x(x-3)=0
x=0, x=3
3、x^2+9=-6x
x^2+6x+9=0
(x+3)^2=0
x+3=0
x=-3
1.
y(3y-5)=0
y=0或y=5/3
2.
x^2-3x=0
x(x-3)=0
x=3或x=0
3.
x^2+6x+9=0
(x+3)^2=0
x= -3
4.题不全