(x + x) + (x-x) + (XX) + (x / x) = 100 to find the value of X? From winter vacation assignment of Yanbian Education Press, page 61

(x + x) + (x-x) + (XX) + (x / x) = 100 to find the value of X? From winter vacation assignment of Yanbian Education Press, page 61

X+X=2X
X-X=0
X/X=1
So the original formula is XX + 2x + 1 = 0
Come together, come up with x = 9 and x = 11
And then check, that's right!

If the equation (3 / X-5) - (AA / xx-25) = 1 about X has an increasing root, then the value of a is (). In this case, the root of the equation is ()

If (3 / X-5) - (A & sup2; / X & sup2; - 25) = 1 has an increasing root, then the increasing root must be x = 5 or x = - 5. Both sides of the equation multiply by (X & sup2; - 25) to get 3 (x + 5) - A & sup2; = x & sup2; - 25X & sup2; - 3x + A & sup2; - 40 = 0. When the increasing root x = 5, a = ± √ 30, the root of the equation is x = - 2. When the increasing root x = - 5, a = 0, the root of the equation is

How to quickly solve the value of X in the equation 2 ^ x + 2.5 ^ x = 100,

Because 2 ^ x + 2.5 ^ x is increasing, it can be judged that there is only one value. In this way, it is most effective to use the single variable solution in the hypothesis analysis in Excel. The specific operation steps are as follows: enter any value in A1, A2 = 2 ^ a1 + 2.5 ^ a1-100, use the single variable solution, A1 is the variable cell

If the equation 3 / x + A / (x + 1) = 2 / (XX + x) - 3 / (x + 1) with respect to X has no solution, the value of a is obtained?

To get the denominator:
3(x+1)+ax=2-3x
(a+6)x=-1
There is no solution when a = - 6
When a-6, x = - 1 / (a + 6) 0, when a = - 5, x = - 1 is root increasing
Therefore, when a = - 6, or - 5, there is no solution