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2x 4x

答: 2x²-4x+1=0 2(x²-2x+1)-2+1=0 2(x-1)²=1 (x-1)²=1/2 x-1=±√2 /2 x=1±√2 /2

配方法 2x²-4x-3=0 x²-2x-1.5=0 x²-2x+1=2.5 (x-1)²=2.5 x-1=±√10/2 x=±√10/2+1 x1=1+√10/2,x2=1-√10/2 公式法 2x²-4x-3=0 Δ=(-4)²-4×2×(-3)=16+24=40 ∵Δ>0 ∴方程有两个不相等的实...

2x²-4x-3=0 2(x²-2x)=3 2(x²-2x+1)=5 2(x-1)²=5 (x-1)²=5/2 x-1=√10/2 或 x-1=-√10/2 x=1+√10/2 或 x=1-√10/2

2x+4x7=72 2x+28=72 2x=72-28 2x=44 x=22

2x^2-4x+1=0 x^2-2x=-1/2 x^2-2x+1=1/2 (x-1)^2=1/2 x=1+√2/2或x=1-√2/2

2(x^2+2x+1)-2-1=0 2(x+1)^2=3 (x+1)^2=3/2 x+1=±根号6/2 x1=-1+根号6/2 x2=-1-根号6/2

前二慢 后二快

1/4x=-1/2x+3 x=(-1/2x+3)x4 x=-1/2x x 4+3x4 x=-2x + 12 x + 2x = 12 3x = 12 x = 4

2x²+4x=1 x²+2x=1/2 x²+2x+1=1/2+1 (x+1)²=3/2 x+1=±√6/2 x=(-2-√6)/2,x=(-2+√6)/2

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