How to solve the equation (16 △ x-3 + 1) × 4 + 6 = 26?

How to solve the equation (16 △ x-3 + 1) × 4 + 6 = 26?

（16÷X－3＋1）×4＋6=26
（16÷X－3＋1）×4=20
16÷X-2=20÷4=5
16÷X=5+2=7
X=16÷7
X = 2 and 2 / 7

The solution of the equation x + 1 / 2 = 2-3 / X is

x+1/X=2-3/X
X=1 X=1/2

(1) The equation with solution x = 3 / 2 is ()
A. 3x = 2 b.3x + 2 = 5 / 2 c.3x-2 = 5 / 2 d.3x + 2 = 0

C
Reason: 3x3 / 2-2 = 9 / 2-4 / 2 = 5 / 2
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How to judge the value of ABC by quadratic function? Please be more specific~~~~~~~~~~~~~~~~~~~

Let's first talk about how to judge the sign. A value: the opening direction of the parabola is up or down. A > 0 is up, A0 is B / A0, and the vertex is below the x-axis. You have to have a sense of image, and immediately think that there must be two intersections between the parabola and the x-axis, so the discriminant B & # - 4ac > 0

Using a simple method to calculate: 12345 square meters - 1235 * 1233

1234 ²-1235*1233
=1234 ²-(1234+1)*(1234-1)
=1234 ²-(1234 ²-1)
=1234 ²-1234 ²+1
=1

Known inequality x + 2 > m + n X-1

From the original inequality, we get
m+n-2＜x＜m
Because m + n-2 < x < m and - 1

If the order of three digits is reversed, the sum of the three digits and the original three digits is 1171, and the three digits can be calculated

Let X be the number of ten, then the number of one is 3x-2, and the number of hundred is x + 1, so 100 (x + 1) + 10x + (3x-2) + 100 (3x-2) + 10x + (x + 1) = 1171. The solution is: x = 3. A: the original three digit number is 437

Given equation 3 (X-Y) ^ 2-5x-2 = 2x-7y-4. Find the value of X-Y

The equation is: 3 (X-Y) ^ 2-7 (X-Y) + 2 = 0
That is, (x-y-2) [3 (X-Y) - 1] = 0
So X-Y = 2 or X-Y = 1 / 3

How to solve the equation 3x-78 = x + 78,

3X-78=X+78
3X-X=78+78
2X=156
X=156÷2
X=78

What are the calculation methods of determinant?

There is no diagonal rule for determinants of order 2 and 3, and there is no diagonal rule for determinants of order 4 and above!
There are several methods to solve the higher order determinant
Use the properties of upper (lower) triangle, upper (lower) oblique triangle, arrow (claw)
Expansion theorem by row and column
Laplace expansion theorem
Bordering method
Recursive relation method
Induction
Special determinant (such as Vandermonde determinant)