6x平方减7x加1等于0
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x^2-3x+1=0即x^2+1=3xx+1/x=(x^2+1)/x=3x/x=3答案是3
x^2+6x-1=0用求根公式x=(-6±√36+4)/2x=-3±√10
x^2+3x-1=0x^2+3x=1x^2+3x+2.25=3.25(x+1.5)^2=3.25x=-1.5土√3.25
-10x^2+2x+3=03x^2+6x+9=03x^2+6x=-93x^2+6x-1=-10
因式分解为(3x+2)(x-4)=0故x=-2/3x=4
∵(x+1)²+|y-2|=0 ∴x+1=0 y-2=0 ∴x=-1 y=2 ∴x²y²+3xy-7x²y²-(5/2)xy+1+5x²
3x^2-7x+3=0等式两边同除x得3x-7+3/x=0即x+1/x=7/33x^2-7x+3=0(1)等式两边同除x^2得3-7/x+3/x^2=0(2)(1),(2)两式相加得3x^2+3/x^
x²+x-²=14
由题意可知x≠0且x≠1且x≠-1原方程两边同乘以x(x+1)(x-1)可得:7(x-1)+3(x+1)=6x7x-7+3x+3=6x10x-4=6x4x=4解得:x=1易知x=1是原方程的增根所以原
x^2-3x+1=0x+1/x=(x^2+1)/x=(x^2-3x+1+3x)/x=(0+3x)/x=3x^2+1/x^2=(x+1/x)^2-2=3^2-2=7
x^2-3x+1=0x^2=3x-1x^4=(3x-1)^2=9x^2-6x+1x^4-7x^2+1=9x^2-6x+1-7x^2+1=2x^2-6x+2=2(x^2-3x+1)=0
Δ=36-4=32x=2分之(6加减4根号2)x=3加减2根号2
6x²-7x+1=0(x-1)(6x-1)=0x=1,x=1/6再问:能详细一点吗谢谢再答:6x^2-6x-x+1=06x(x-1)-(x-1)=0(x-1)(6x-1)=0
2x^2-3x+1=0(2x-1)(x-1)=02x-1=0x=1/2x-1=0x=1
6x^2-7x+1=0(6x-1)(x-1)=06x-1=0或x-1=0x=1/6或x=1请在评价时一定选择“能解决问题”,并以五星作评价.如果还不满意,欢迎追问.
x平方+9x=1x平方+9x+81/4=1+81/4(x+9/2)平方=85/4x+9/2=±根号85/2x=-(9-根号85)/2,x=-(9+根号85)/2
(1)6x²-7x+1=0,十字相乘:(6x-1)*(x-1)=0,所以x=1/6或x=1(2)5x²-9x-18=0,(5x+6)*(x-3)=0,所以x=6/5或x=3(3)4
2x²-3x+6=0∵a=2,b=-3,c=6b²-4ac=(-3)²-4×2×6=9-48=-39<0∴原方程无实数根.
2x平方-3x+1=32x平方-3x=2-4x平方+6x+7=(2x平方-3x)×(-2)+7再答:=2×(-2)+7=7-4=3