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用公式法解下列方程①x2-4x+2=0②x2=2√3x-3③2x﹙x-3﹚=-6x+5④3y+5﹙2y+3﹚=0
人气:214 ℃ 时间:2020-03-28 23:31:39
解答
①x²-4x+2=0x²-4x+4-2=0(x-2)²=2x-2=±√2x1=2+√2,x2=2-√2②x²=2√3x-3x²-2√3x+3=0x²-2√3x+(√3)²=0(x-√3)²=0x=√3③2x﹙x-3﹚=-6x+52x²-6x=-6x+5(√2x)²=5...
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