X1.x2 is x ^ 2 + X-2 = 0, X1 + x2 =?

X1.x2 is x ^ 2 + X-2 = 0, X1 + x2 =?

x1+x2=-1

Find the following: 1, all integer solutions 2, a group of fractional solutions 3, a group of negative solutions of the binary linear equation 3x + 2Y = 20
Brother and sister, please!

All integer solutions
x= 0 y= 10
x= 2 y= 7
x= 4 y= 3
x= 6 y= 1
A set of fractional solutions
x= 1/2 y= 37/4
A set of negative solutions
x= -2 y= 13

A mathematical problem is solved by a quadratic equation of two variables
If you move 1 to the last digit of a six digit number, the new six digit number will be three times of the original six digit number

142857
Let the original number be 100000 + a
From the meaning of the title, we can get (10a + 1) = 300000 + 3a
a=42857
So the original number is 142857