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√5x+2=0(7)(x+1)^2-3(x+1)=-12...
(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 展开
(7)(x+1)^2-3(x+1)=-12 展开
3个回答
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(1)x^2+12x+27=0
(x+3)(x+9)=0
x=-3或x=-9
(2)x(培哪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纯中镇=3
x=√5+√3 x=√5-√3
(7)(x+1)^2-3(x+1)=-12
(x+1)²做粗-3(x+1)+12=0
△=-39<0
无解
(x+3)(x+9)=0
x=-3或x=-9
(2)x(培哪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纯中镇=3
x=√5+√3 x=√5-√3
(7)(x+1)^2-3(x+1)=-12
(x+1)²做粗-3(x+1)+12=0
△=-39<0
无解
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