In the above subtraction formula, each letter represents a number, and different letters represent different numbers, then d + C =? ABCBD - EFAG = FFF

In the above subtraction formula, each letter represents a number, and different letters represent different numbers, then d + C =? ABCBD - EFAG = FFF

10706-9818=888
So D + C = 7 + 6 = 13

In the following letter formula, each letter represents a number, and different letters represent different numbers. If the five digit number represented by China can be divided by 24, then the five digit number is zero______ ．

It is obvious that C = 1, k = 9, and the hundred bit is 1 to the thousand bit. Because on the tenth bit, n = 9, or n = 0, because k = 9, n = 0. On the hundred bit, because the hundred bit is 1 to the thousand bit, O = 5, 6, 7, 8

Which number plus eight minus eight times eight divided by eight equals eight

8

As shown in the figure, the area of the shadow part is 18 times of the area of the circle and 16 times of the area of the parallelogram, so the simplest ratio of the area of the circle and parallelogram in the figure is ()
A. 16：18B. 4：3C. 3：4D. 5：7

Let the area of the shadow part be 1, then: area of circle × 18 = area of parallelogram × 16 = 1, area of circle: 1 △ 18 = 8; area of parallelogram: 1 △ 16 = 6; area of circle: area of parallelogram = 8:6 = 4:3

If the image opening of quadratic function y = - kx2 + 2x-k is upward and there is no intersection with X axis, the value range of K is obtained

Image opening up
-k＞0
k＜0
There is no intersection with the X axis
∴⊿=4－4×k×k＜0
K ＜ - 1 or K ＞ 1
The range of K is k ＜ - 1

If (x + m) (x + 2) = x2-6x + N, then M=______ ，n=______ ．

(x + m) (x + 2) = x2 + (M + 2) x + 2m = x2-6x + N, M + 2 = - 6, 2m = n, M = - 8, n = - 16. So the answer is: - 8; - 16

The area of a right triangle is 50 square centimeters. How many square centimeters is the area of the circle where the triangle is located
÷ ×
1 / 2 * r * r = 50. R * r = 100 circle area = R * r * 3.14 = 314 (square centimeter)
I really can't understand this. Don't divide and multiply like that = = and it seems wrong. I'm offering a reward!

We know that the three vertices of a right triangle are in a circle, and the hypotenuse is the diameter. This right triangle should be isosceles, otherwise there are countless right triangles of area 50, and the diameter of the hypotenuse cannot be determined
Is isosceles right triangle: right angle vertex to the center of the circle, that is, the middle point of the hypotenuse is radius and vertical hypotenuse diameter. 1 / 2 × 2R × r = 50 R & # 178; = 50
So, circle area = 50 π = 157 square centimeters
1 / 2 * r * r = 50 is wrong. The length of two right angles is not equal to radius R

The image of hyperbola y = 4x and y = 2x in the first quadrant is shown in the figure. Make a straight line parallel to the Y axis, intersect the hyperbola at two points a and B respectively, and connect OA and ob, then the area of △ AOB is ()
A. 1B. 2C. 3D. 4

Let the line AB intersect the x-axis at the point C. ∵ ab ∥ y-axis, ∵ AC ⊥ x-axis, BC ⊥ x-axis. ∵ point a on the image of hyperbola y = 4x, ∵ AOC area = 12 × 4 = 2. Point B on the image of hyperbola y = 2x, ∵ cob area = 12 × 2 = 1

How to read the sign of partial derivative? What letter is it?

That's the classical way of writing the Greek letter δ. In mathematics, it's only used as a sign to express the partial derivative. When expressing the partial derivative, we usually don't read the name of the letter. Most Chinese people read it as "partial". For example, the partial derivative of Z to x is read as "partial Z, partial X"

Four out of seven meters means to divide one meter into several parts on average? How many parts does it mean? Four out of seven meters can also be understood as dividing four meters into seven parts on average, that is, how many meters is four meters divided by seven?

One meter divided into seven parts means such four parts. It can be understood that four meters are divided into seven parts on average, that is, four meters divided by seven equals four out of seven meters