What I said can be understood by the fourth graders Two barrels of oil a and B weigh 24 kg in total. The first time, the same amount of oil was poured from barrel a into barrel B and the second time from barrel B There is as much oil in the barrel as in the barrel A. at this time, there is as much oil in the two barrels. How many kilos of oil did each barrel have?

What I said can be understood by the fourth graders Two barrels of oil a and B weigh 24 kg in total. The first time, the same amount of oil was poured from barrel a into barrel B and the second time from barrel B There is as much oil in the barrel as in the barrel A. at this time, there is as much oil in the two barrels. How many kilos of oil did each barrel have?

A barrel:
(24 ﹣ 2) ﹣ 2 + (12 + 6) ﹣ 2 = 15 (kg)
B barrel:
24-15 = 9 (kg)
——————————————————
After the final oil pouring: a barrel: 24 △ 2 = 12kg
B barrel: 24 △ 2 = 12kg
Before final oil pouring: a barrel: 12 △ 2 = 6kg
B barrel: 12 + 6 = 18 kg
After first pouring oil: B barrel: 18 △ 2 = 9kg
A barrel: 6 + 9 = 15kg

Ask primary school fourth grade mathematics exercise paper (the best more handed equation) 100000 urgent!
Ask the fourth grade of primary school mathematics exercise paper (the best delivery equation) the more the better, 100000 urgent

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Mathematics exercise paper for grade four of primary school
Class:______ Name:_______ Results:__________
1、 Fill in the blanks. (28 points in total)
(1) 5468000 is a () digit, of which 6 is in ()), and its counting unit is ()
(2) 280.6 million writing (). The approximate number written in "100 million" is ()
(3) 470 + 183 + 117 = 470 + (+)
(4) 6m 35cm = () cm 126000m2 = () ha
7800kg = () ton () kg 37min = () hour () min
2.08t = () t () kg 2m 40cm = () M
(5) fill in ">" in 0“

1. The children's Park has built a cylindrical water entertainment center with a bottom radius of 10 meters. Tiles should be pasted at the bottom and around it. What is the area of tiles?

What's the bottom area
10 × 10 × 3.14 = 314 (M2)
What is the lateral area
10 × 2 × 3.14 × 2 = 125.6 (M2)
What is the area to be tiled
314 + 125.6 = 439.6 (M2)

(- M + n) (m-n) with square difference formula
The synchronous exercise book of mathematics of China Normal University

(-m+n)(m-n)
=-m²+mn+mn-n²
=-m²+2mn-n²;
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A sufficient and unnecessary condition for an image of a linear function y = − mnx + 1n to pass through the first, third and fourth quadrants at the same time is______ ．

When m = 1 and N = - 1, the image of the first-order function y = - mnx + 1n = X-1 obviously passes through the first, third and fourth quadrants. However, when the image of the first-order function y = - mnx + 1n passes through the first, third and fourth quadrants at the same time, m = 1 and N = - 1 do not necessarily hold. Therefore, a sufficient and unnecessary condition for the image of the first-order function y = - mnx + 1n to pass through the first, third and fourth quadrants at the same time is If M = 1, n = - 1, the answer is m = 1, n = - 1 (the answer is not unique)

X-55 - (100 + x) * 0.01 ≥ 20,

X-55-(100+X)*0.01≥20
X-55-1-0.01X≥20
0.99X≥76
X≥7600/99

Mathematics practical problems in Grade 6 of primary school
A pool can hold 47.2 cubic meters of water. There is only one water inlet pipe which can fill the empty pool with 17.7 square meters of water in three hours?

Set this inlet pipe to fill the empty tank in X hours
Water inflow per hour × time = tank volume
17.7÷3×x＝47.2
5.9x＝47.2
x＝47.2÷5.9
x＝8

The focus of the ellipse is on the x-axis, the length of the short half axis is 4, and the eccentricity is 1 / 2. Try to find its standard equation

The focus of the ellipse is on the x-axis,
Let the equation of ellipse be: X & sup2 / A & sup2; + Y & sup2 / B & sup2; = 1, (a > b > 0), and the focal length is 2C,
B = 4, C / a = 1 / 2,
And a & sup2; = B & sup2; + C & sup2;
∴a²=16/3
The equation of ellipse is: 3x & sup2 / 16 + Y & sup2 / 16 = 1

Sequence 0, 1, 0, - 1, 0, 1, 0, - 1 A general formula of is ()
A. (−1)n+12B. cosnπ2C. cos(n+1)π2D. cos(n+2)π2

When n = 4, (− 1) n + 12 = 1, does not satisfy the meaning of the problem; when n = 2, Cosn π 2 = - 1, does not satisfy the meaning of the problem; when n = 1, cos (n + 1) π 2 = - 1, does not satisfy the meaning of the problem; option D is correct, the verification knowledge can exactly represent this sequence; so choose D

How much is 360 minus 54 degrees 18

305 ° 42