几道一元二次方程x²+2根号5x+10=0x²+4x+8=2x+113x²-12x=-122x²+5x-1=0x²-10x+25=(5-2x)²
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几道一元二次方程x²+2根号5x+10=0x²+4x+8=2x+113x²-12x=-122x²+5x-1=0x²-10x+25=(5-2x)²
几道一元二次方程
x²+2根号5x+10=0
x²+4x+8=2x+11
3x²-12x=-12
2x²+5x-1=0
x²-10x+25=(5-2x)²
几道一元二次方程x²+2根号5x+10=0x²+4x+8=2x+113x²-12x=-122x²+5x-1=0x²-10x+25=(5-2x)²
1) 2) 3) 4)
x²+2√5x+10=0 x²+4x+8=2x+11 3x²-12x=-12 2x²+5x-1=0
Δ=20-40
第一个看不出是什么意思。第二个X=1或-3 第三个 X=2 第四个 X=-8-根号33/4 或-8+根号33/4 第五个 0
(1)无解
(2)x=-3或x=1
(3)x=2两根相等
(4)Δ=33
x=(-5±√33)/4
(5)x=10/3或x=0