解下列方程:(1)x^2+12x+27=0 (2)x(5x+4)=5x+4 (3)-3x^2+22x-24=0(4)(3x+2)(x+3)=x+14 (5)2(x+3)^2=x(x+3) (6)x^2-2√5 x+2=0(7)(x+1)^2-3(x+1)=-12
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![解下列方程:(1)x^2+12x+27=0 (2)x(5x+4)=5x+4 (3)-3x^2+22x-24=0(4)(3x+2)(x+3)=x+14 (5)2(x+3)^2=x(x+3) (6)x^2-2√5 x+2=0(7)(x+1)^2-3(x+1)=-12](/uploads/image/z/224667-27-7.jpg?t=%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%EF%BC%9A%EF%BC%881%EF%BC%89x%5E2%2B12x%2B27%3D0+%EF%BC%882%EF%BC%89x%EF%BC%885x%2B4%EF%BC%89%3D5x%2B4+%EF%BC%883%EF%BC%89-3x%5E2%2B22x-24%3D0%EF%BC%884%EF%BC%89%EF%BC%883x%2B2%29%28x%2B3%29%3Dx%2B14+%EF%BC%885%EF%BC%892%EF%BC%88x%2B3%29%5E2%3Dx%EF%BC%88x%2B3%29+%286%29x%5E2-2%E2%88%9A5+x%2B2%3D0%EF%BC%887%EF%BC%89%EF%BC%88x%2B1%29%5E2-3%EF%BC%88x%2B1%29%3D-12)
解下列方程:(1)x^2+12x+27=0 (2)x(5x+4)=5x+4 (3)-3x^2+22x-24=0(4)(3x+2)(x+3)=x+14 (5)2(x+3)^2=x(x+3) (6)x^2-2√5 x+2=0(7)(x+1)^2-3(x+1)=-12
解下列方程:(1)x^2+12x+27=0 (2)x(5x+4)=5x+4 (3)-3x^2+22x-24=0
(4)(3x+2)(x+3)=x+14 (5)2(x+3)^2=x(x+3) (6)x^2-2√5 x+2=0
(7)(x+1)^2-3(x+1)=-12
解下列方程:(1)x^2+12x+27=0 (2)x(5x+4)=5x+4 (3)-3x^2+22x-24=0(4)(3x+2)(x+3)=x+14 (5)2(x+3)^2=x(x+3) (6)x^2-2√5 x+2=0(7)(x+1)^2-3(x+1)=-12
(1)x^2+12x+27=0
(x+3)(x+9)=0
x=-3或x=-9
(2)x(5x+4)=5x+4
(5x+4)(x-1)=0
x=-4/5或x=1
(3)-3x^2+22x-24=0
3x²-22x+24=0
(3x-4)(x-6)=0
x=4/3或x=6
(4)(3x+2)(x+3)=x+14
3x²+10x-8=0
(3x-2)(x+4)=0
x=2/3或x=-4
(5)2(x+3)^2=x(x+3)
(x+3)(x+6)=0
x=-3或x=-6
(6)x^2-2√5 x+2=0
x²-2√5x+5=3
(x-√5)²=3
x=√5+√3 x=√5-√3
(7)(x+1)^2-3(x+1)=-12
(x+1)²-3(x+1)+12=0
△=-39
(1)x1=-3,x2=-9 (2)x1=1,x2=-0.8 (3)x1=4/3,x2=6
这些都是最最基本的方程,可以运用公式法,因式分解法等求解