In a hurry, add 100 points and 100

m n= Then there are two cases

1) m is also an empty set.

That is, the equation x -4x + 2m + 6 = o has no solution.

With the discriminant formula, we get (-4) 2-4(2m+6)<0 and get m>-1

2) The value of x in the m set is greater than or equal to 0

Because x in n is less than 0.

There is an empty set where they intersect, and it is easy to get the conclusion above

That is, x -4x+2m+6=o has a solution and its solution is greater than or equal to 0.

Then there is a relationship between the two roots that can be found.

Let the two be x1 and x2

x1+x2=4

x1x2=2m+6>=0

The solution yields m>=-3

Only one of the two cases is sufficient.

So put them together.

m>=-3

m：x^-4x+2m+6=o

x are the two roots of the equation.

n：x<0

The intersection is zero, indicating that both roots are greater than or equal to zero.

The opening is known to be upward.

So there is. When the axis of symmetry is 0 and x=0, the value of the function is greater than or equal to zero.

b/2a=2>0

When x=0, the function =2m+6 0

Get m -3

According to the inscription m n= ,y=x -4x+2m+6 The function image has at least one intersection point with the x-axis, that is, the discriminant formula 》0,16-4(2m+6)》0

Solve m"-1

The opening is known to be upward.

So when there is an axis of symmetry 0 and x=0, the value of the function is greater than or equal to zero b 2a=2>0

When x=0, the function =2m+6 0

m -3 so -3 "m "-1

m n= means that m and n do not intersect, since n {x x<0}, the value in m is greater than or equal to zero. So the root of the equation x -4x+2m+6=o is greater than or equal to zero.

So the sum of the two roots is greater than zero, and the product of the two roots is greater than or equal to zero.

That is: x1x2>=0

2m+6>=0

The solution yields m>=-3

x in m must be greater than 0

b 2-4ac = 16-4 (2m + 6) = -8m - 8b plus or minus the root number b 2-4ac 2a> = 0

4. Addition and subtraction of root number: 8m-8 2>=0

Positive and negative root numbers -8m-8<=4

8m-8<=16

8m>=-24

m>=-3

m n is equal to the empty set, which means that all the elements in m are greater than or equal to zero.

The equation in m, the discriminant is less than or equal to zero, and you can solve it yourself. Finish.

75 divided by 5/12 = 180 180 multiplied by 2/9 = 40

26 divided by (1 minus 25/51) = 51

240 times 3/4 = 180 180 divided by 1/4 = 720

Divide by 5/12 = 180 180 times 2/9 = 40

25x=36 (problematic calculations).

Equal to 240 times 3 4, x = 720