one

Square of (1)p -4q

(2) plus or minus 4

(3)k is greater than 1.

(4)m is less than or equal to 65438+9/06.

two

(1) solution: the square of (m+ 1)x +2x- 1=0.

△=4m+8

When 4m+8 is greater than 0 and m+ 1 is not equal to 0.

4m is greater than -8 and m is not equal to-1.

That is, when m is greater than -2 and m is not equal to-1.

The original equation has two unequal real roots.

(2) Solution: When 4m+8=0

That is, m=-2

The original equation has two equal real roots.

(3) Solution: When 4m+8 is less than 0.

That is, m=-2

The original equation has no real roots.

three

(1) solution: △=(-2k) square -4(2-k)

=4k squared -4k+8

(k-2)(k+ 1)=0

K=2 or k-=- 1

So when k=2 or k-=- 1, the original equation has two equal real roots.

I hope it helps you.