In the addition and subtraction of rational numbers, what is the form of converting subtraction into addition and writing the sum of omitted plus sign For example, what is the meaning of converting subtraction into addition, and writing the formula in the form of omitting the plus sign

In the addition and subtraction of rational numbers, what is the form of converting subtraction into addition and writing the sum of omitted plus sign For example, what is the meaning of converting subtraction into addition, and writing the formula in the form of omitting the plus sign

According to the algorithm, subtracting a number is equal to adding the opposite number of the number, and unifying the subtraction operation into the addition operation. The process of this change is transforming into addition. Unifying the addition, the plus sign can be omitted, so as to achieve the form of algebraic sum of omitted plus sign
2－（－4）+36－41－15
＝2+4+36+（－41）+（—15）
The form of omitting the sum of the plus sign is algebra and form
2+4+36－41－15

The time ratio of a certain sewing master to make a shirt, a pair of trousers and a coat is 1:2:3. He can make two shirts, three trousers and four coats in ten working hours. So he needs 14 shirts, 10 trousers and two coats______ Working hours

Suppose that the sewing time for a shirt is x, then the sewing time for a pair of trousers is 2x, and the sewing time for a coat is 3x. Since it takes ten working hours to complete 2 shirts, 3 trousers, and 4 coats, that is, 2x + 3 × (2x) + 4 × (3x) = 10 (working hours), that is, 20x = 10 (working hours), then it takes 2 × (3x) + 10 × (2x) + 14x = 40x = 20 (working hours) to complete 2 shirts, 10 trousers, and 14 shirts, So the answer is 20

In the arithmetic sequence, if the tolerance d = 1, A3 + A4 = 1, then A2 + A4 +... + A20 is equal to what?

a3+a4=2*a1+5d=1,
a1=-2
a2+a4+...+a20=10*a1+100*d=80

8 liters 42 ml = () cubic decimeter = () cubic centimeter

8 liter 42 ml = (8.042) cubic decimeter = (8042) cubic centimeter

The passenger car and the freight car run from a and B at the same time. They meet each other in five hours. After meeting, the passenger car goes to B in three hours. It is known that the freight car travels 63 kilometers per hour, and how many kilometers per hour does the passenger car travel?

63 × 5 ／ 3, = 315 ／ 3, = 105 (km), answer: the bus travels 105 km per hour

Is the area of marble and granite calculated by square meters? Is the line calculated by square meters? Is the length multiplied by the width converting meters into centimeters

Master, mathematics is not so good
Is the area of marble and granite calculated by square meter
yes
And whether the lines are calculated by meters
yes
Is square meter length multiplied by width to convert meter into centimeter
If it's a rectangle, the area is length x width. If the centimeter is converted into meter, then the square meter is obtained

If we know that the value of the polynomial 5x ^ 2-6x + 10 is 5, then the value of x ^ - 6 / 5x-3 is 5

The value of the polynomial 5x ^ 2-6x + 10 is 5,
Namely
x^2-6/5x+2=1
x^2-6/5x=1-2=-1
Then x ^ - 6 / 5x - 3 = - 1 - 3 = - 4

The diameter of the bottom surface of a cylinder is 10 cm and the height is 8 cm. What is the surface area of the cylinder in square cm? What is its volume in cubic cm?

Hanying warm for you
Bottom area: 3.14 × (10 / 2) ^ 2 = 78.5 square centimeter
Side area: 3.14 × 10 × 8 = 251.2 square cm
Surface area: 251.2 + 78.5 × 2 = 408.2 square centimeter
Volume: 78.5 × 8 = 628 cm3
The surface area is 408.2 square centimeters and the volume is 628 cubic centimeters
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Column equation solution text problem, a number minus 16.5 is equal to 28, find this number

28+16.5=44.5
———————————————————————————————————————————
Let this number be x, then
X-16.5=28
X=28+16.5
X=44.5

Let the line L: y = T ^ 2-T, t belong to (0,1 / 2). If the area of the closed figure enclosed by the image of line L and f (x) = x ^ 2-x and Y axis is S1 (T), the area of the closed figure enclosed by the image of line L and f (x) is S2 (T). Let g (T) = S1 (T) + (1 / 2) S2 (T), the value of T is obtained when G (T) takes the minimum value

Brother, your calculation of this problem is not small, but the score is very small