Put one? +5a+ 1=0，b？ +5b+ 1 = 0 divided by a.b.

Get a+5+1/a = 0b+5+1/b = 0.

So a+ 1/a=-5 b+ 1/b=-5.

Substitute (a+ 1, b+ 1)+( b+ 1, a+ 1) to get -8.

1

Because of mx? +(2m+3)x+ 1=0 has two real roots whose product is 1.

So 1/m= 1.

m= 1

Replace x? +(2a+m)x+2a+ 1-m=0

x？ +(2a+ 1)x+2a+=0

2a > when x=0; 0a & gt； 0

When x=4, a & gt-2

So a=- 1