用配方法解一元二次方程 x²+4x-1=0 x²-4x+4=0 4x²+16x+16=9 3x²-12x+6=0
用配方法解一元二次方程 x²+4x-1=0 x²-4x+4=0 4x²+16x+16=9 3x²-12x+6=0
数学人气:505 ℃时间:2019-11-21 10:17:50
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(1) x²+4x-1=0 (x+2)²-5=0(x+2)²=5x=±√5-2(2)x²-4x+4=0(x-2)²=0x=2(3)4x²+16x+16=9(2x+4)²=9x=-1/2或-7/2(4)3x²-12x+6=0两边同除以3,得x²-4x+2=0(x-2)²...
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