第1个回答 2016-07-14
2x²－3x－6＝0
2(x²-3/2x)=6
x²-2×3/4x+(3/4)²=6+(3/4)²
(x-3/4)²=6+9/16
(x-3/4)²=105/16
x-3/4=±√(105/16)
x=3/4±√105/4
x=(3±√105)/4本回答被网友采纳
2(x²-3/2x)=6
x²-2×3/4x+(3/4)²=6+(3/4)²
(x-3/4)²=6+9/16
(x-3/4)²=105/16
x-3/4=±√(105/16)
x=3/4±√105/4
x=(3±√105)/4本回答被网友采纳
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