Question

解方程：(x-1)^2=9

(2x+3)^2=4
x^2-6x+9=5
(x-5)^2=5

Answer 1

1. (X-1)^2=9

        X-1=±3

            X=4或-2

2. （2X+3）^2=4

            2X+3=±2

                 2X=-1或-5

                   X=-1/2或-5/2

3. X^2-6X+9=5

       (X-3)^2=5

            X-3=±√5

                X=3±√5  

4. (X-5)^2=5

     X-5=±√5

         X=5±√5

Answer 2

x-1=3 2x+3=2 (x-3)^2=5 x-5=±√5
x=4 x=-1/2 x-3=±√5 x1=5+√5 x2=5-√5
x1=3+√5 x2=3-√5

竖着看。。分别为第一道第二道依次的。。不懂的问我。我都省去了开方

Answer 3

1. x-1=±3

       x=4或-2

  2.2x+3=±2

     x=-1/2或-5/2

  3.x^2-6x+9=(x-3)^2=5

     x-3=±根号5

     x=3+根号5或3-根号5

 4.x-5=±根号5

   x=5+根号5或5-根号5

Answer 4

(x-1)²=9
x-1=±3
∴x1=4
x2=-2

(2x+3)²=4
2x+3=±2
2x=-3±2
x=(-3±2)/2
∴x1=-2.5
x2=-0.5

x²-6x+9=5
(x-3)²=5
x-3=±√5
∴x1=3+√5
x2=3-√5

(x-5)²=2
x-5=±√2
x=5±√2
∴x1=5+√2
x2=5-√2