1. x^2-4x-3=02. x^2-1/2x-1/2=0 [注:1/2是(2分之1)]3. x(x+6)=74. (x-1)(x+2)=70请详细写,最好写成如下格式:移项,得两边都加上( ),得化简,得开平方,得则x1=... x2=...
參考答案:. x^2-4x-3=0
化简：[x-2]^2=7
开平方得：
x-2=+/-根7
x1=2+根7
x2=2-根7
2. x^2-1/2x-1/2=0 [注:1/2是(2分之1)]
化简；[x-1][x+1/2]=0
x1=1
x2=-1/2
3. x(x+6)=7
化简：x^2+6x=7
移项：x^2+6x-7=0
[x+7][x-1]=0
x1=-7
x2=1
4. (x-1)(x+2)=70
化简：x^2+x-2=70
移项：x^2+x-72=0
[x+9][x-8]=0
x1=-9
x2=8
