用适当方法解下列方程 1. 2x^2=5-3x 2. 3x^2+4=4倍根号3x 3. 4x^2-3x=0
人气：262 ℃ 时间：2019-08-21 22:03:19
解答
1.2x²=5-3x 2x²+3x-5=0(2x+5)(x-1)=0x1=-5/2,x2=12.3x²+4=4√3x 3x²-4√3x+4=0(√3x-2)²=0x1=x2=2/√33.4x²-3x=0x(4x-3)=0x1=0,x2=3/4
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