0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7=0
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![0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7=0](/uploads/image/z/669092-68-2.jpg?t=0.3x%26%23178%3B%2Bx%3D0.8+x%26%23178%3B%2B3%3D2%E2%88%9A3x+x%26%23178%3B%2B2x-2%3D0+3x%26%23178%3B%2B4x-7%3D0)
0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7=0
0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7=0
0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7=0
0.3x²+x=0.8
3x²+10x=8
(3x+5)²=49
3x+5=±7
x=-4或2/3
x²+3=2√3x
x²-2√3x+3=0
(x-√3)²=0
x=√3
x²+2x-2=0
(x+1)²=3
x+1=±√3
x=±√3-1
3x²+4x-7=0
(3x+2)²=11
3x+2=±√11
x=(±√11-2)/3