For example: a do x a day, B do y a day, a and B do the same, a first do a few days, B do a few days, ask a and B how much work is each The XY I said is just a virtual number. The point is to help me solve this type of problem

For example: a do x a day, B do y a day, a and B do the same, a first do a few days, B do a few days, ask a and B how much work is each The XY I said is just a virtual number. The point is to help me solve this type of problem

Party A and Party B do the same project. It takes 30 days for Party A to do it alone and 40 days for Party B to do it alone

1. If the absolute value of B = - B, the absolute value of AB = - AB, then the absolute value of A-B + 3 - b-a-2 is equal to ()
2. In the following statements, the wrong one is ()
A. If you divide zero by any number, the quotient is zero
B. The product of any number and zero is still zero
C. The opposite of zero is still zero
D. The sum of two opposite numbers is zero
3. When does the hour hand and minute hand on the clock face form an angle of 120 ° between 3 o'clock and 4 o'clock (excluding the whole hour)?
4. Let the sum of three digits 2A3 and 32B be 5B9, and find the value of a and B
5. There are three kinds of items in a store, and the price of each item is 2 yuan, 4 yuan and 6 yuan respectively. Now we use 60 yuan to buy these three kinds of items, and a total of 16 items are bought. If the money is just used up, how many items can we buy at most with the price of 6 yuan? How many items can we buy at least with the price of 2 yuan?
6. In RT △ ABC, ∠ C = 90 ° the geometry obtained by rotating a circle around AC axis is ()
7. The distance between a and B is 16km. A and B start from a and B at the same time. A returns to a according to the original route after half an hour's rest at B. B returns to B after 40 minutes' rest at a. when they meet on the way back, according to the departure time of 4 hours, if a walks 2km more than B per hour, the speed of a and B is calculated

I = absolute value because the absolute value of negative number equals its opposite number, so B is negative. Because the absolute value of AB = - AB, a is positive. Ia-b + 3i-ib-a-2i = A-B + 3 - (- B + A + 2) = 12. The sum of the opposite number of D 2 and the opposite number of 1 is not 03.4.2a3 + 32B = 5b9b = 62a3 = 569-326 = 243a = 45.6

If the square + (m-1) a + 9 of polynomial 4a is a complete square, M =?

If the square + (m-1) a + 9 of the polynomial 4a is a complete square
=(2a±3)²
∴m-1=±2×2×3;
Ψ M = - 11 or - 13;
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Xiao Ming uses a rope to measure the circumference of a tree trunk. After selecting the tree trunk to be measured, he uses a two fold rope to wrap around it for another 1.5 meters. If he uses a three fold rope to measure it, it will wrap around it for another 2 meters. How many meters is the circumference of the tree trunk?

The correct way to solve the problem with one variable linear equation is: let the circumference of the trunk be x meters

The diagonals AC and BD of parallelogram ABCD intersect at O, EO ⊥ BD intersects at e, AE = OE = 1 / 2be

∵EO⊥BD OE=1/2 BE
∴ ∠ABO=30°
∴∠BEO=60°
∵AE=OE
∴∠OAE=∠AOE
∵ ∠BEO=∠OAE+∠AOE= 2 ∠OAE
∴∠OAE=30°
∴∠OAE=∠ABO
∴OA=OB
ABCD is a parallelogram
∴AC=2OA BD=2OB
∴AC=BD
The parallelogram ABCD is a rectangle

The wetland area of Jiangsu Province is 4 million hectares, accounting for two fifths of the whole province. What is the total area of Jiangsu Province
Determinant

400 divided by 2 / 5 = 1000

A train is 160 meters long. It takes 30 seconds for the whole train to cross the 440 meter bridge. How many kilometers per second does the train travel?

(160 + 640) / 30 = 20 m / S = 0.02 km / S

Calculate the volume of the cylinder: the height of the cylinder is 5cm and the bottom is 8cm

Is 8 diameter or radius
If it's diameter, divide it by two
According to radius 8, 3.14x8 ^ 2x5 = 1004.8
Calculated by diameter 8, 3.14x 4 ^ 2 * 5 = 251.2

What are the characteristics of numbers divisible by 101?

Similar to the truncated 3-bit method divided by 7 and 13, the truncated 2-bit method can be used to determine the division by 101
A multi bit number intercepts the last two bits. A new number is formed by the last two bits and the previous high bits, and the two new numbers are subtracted
Repeat the above steps until the difference is small enough. If the difference can be divided by 101, the original number can be divided by 101
For example:
13635：
136 - 35 = 101 OK, the original number can be divided by 101
99753054：
997530 - 54 = 997476
9974 - 76 = 9898
98 - 98 = 0 OK, the original number can be divided by 101
9975265：
99752 - 65 = 99687
996 - 87 = 909
9 - 09 = 0 OK, the original number can be divided by 101

What's the ratio between the number of turns of minute hand on the clock and the number of days, and why
A little confused
Proportional or inverse, not ratio

One day spin
24 × 60 = 1440 rpm
That is 1440:1