2x^2 3x-1=0配方法
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3x平方-5x=-2x^2-5x/3=-2/3(x-5/6)^2=1/36x-5/6=土1/6x1=1x2=2/31/4x²-x-4=0x^2-4x=16(x-2)^2=20x-2=±2√5
2x²-x-1=0x²-0.5x=0.5x-0.5x+0.0625=0.5625(x-0.25)²=0.5625x-0.25=±0.75x=0.25±0.75x1=-0.
4分之1x²-2x-12=0x²-8x-48=0(x-4)²=64x-4=8或x-4=-8x=12,或x=-4
(2x--1)(x–1)=0x=1/2x=1
4x^2+8x-3=04(x+1)^2-7=0x+1=±√7/2x=(-2±√7)/22x^2+1=3x2(x-3/2)^2-7/2=0x-3/2=±√7/2x=(3±√7)/2
1)-3X的平方+22X-24=0即:x^2-22/3x+8=0(x-11/3)^2=49/9x-11/3=(+/-)7/3x1=11/3+7/3=6x2=11/3-7/3=4/32)2x^2+6=7
2x平方-4x-1=02x^2-4x+2=32(x-1)^2=3(x-1)^2=3/2x-1=±√6/2x=1+±√6/2
2x²+3x+1=02(X+3/4)²=1/8所以X=-1/2或X=-1再问:答案是你这个我做出来是(X+3/4)²=1/4再答:对于配方法最好的就是检验一下,自己算一下
2X的平方-3X=-0.52X的平方=3x-0.5X的平方=(3x-0.5)/2X=根号下(3x-0.5)/2再问:老大用配方法。。。我为毛会算出x1=4分之3+根号5。。。。唉。。。。。
解由2x²+4x+1=0得2x²+4x+2-1=0即2(x²+2x+1)-1=0即2(x+1)²-1=0即2(x+1)²=1
3x方-2x-1=03(x²-2x/3+1/9)-1/3-1=03(x-1/3)²=4/3(x-1/3)²=4/9x-1/3=±2/3x1=1/3+2/3=1x2=1/3
x²-8X+4-6=0(x-2)²=6x-2=根号6x=2+根号6
2X^2-6X+1=0可以用配方法和公式法△=36-4x2=28x=(6+2倍根号7)/4x=(6-2倍根号7)/4X=(3+根号7)/2X=(3-根号7)/2希望能帮到你!
1.x^2-x=7/4x^2-x+1/4=2x-1/2=根号2x=根号2+1/22.x^2+2x-4/3=0x^2+2x=4/3x^2+2x+1=7/3x=1/3根号21-1
两边除以-2x²-x=1/2x²-x+1/4=1/2+1/4(x-1/2)²=3/4x-1/2=±√3/2x=(1-√3)/2,x=(1+√3)/2
x²-x-1=0x²-x+1/4=5/4;(x-1/2)²=5/4;x-1/2=±√5/2;x=1/2±√5/2;
解方程:2(x-3)=x+3方程左边展开得到:2(x-6x+9)=x+3则2x-12x+18=x-3方程左右两边同时加上(3-x)得到:2x-13x+21=0则(2x-7)(x-3)=0解得x1=7/
4x^2-x-9=0两边同时除以4,得x^2-(1/4)x-(9/4)=0移项,得x^2-(1/4)x=9/4两边同时加上(1/8)^2,得x^2-(1/4)x+(1/8)^2=(9/4)+(1/8)