There is a cuboid glass container. The container measures 40cm long, 30cm wide and 35cm high from the inside. He injects some water into the container until the water depth is 10cm. Finally, he puts a cube iron block with 20cm edge length into the water and finds that the top of the iron block is still higher than the water surface. So, what is the water depth at this time?

There is a cuboid glass container. The container measures 40cm long, 30cm wide and 35cm high from the inside. He injects some water into the container until the water depth is 10cm. Finally, he puts a cube iron block with 20cm edge length into the water and finds that the top of the iron block is still higher than the water surface. So, what is the water depth at this time?

40*30*10/((40*30)-(20*20))=15（cm)

A cuboid glass fish tank without cover is 50cm in length, 40cm in width and 20cm in height. When 30L water is injected into the fish tank, how much is the water depth?

Hello
30L=30000ml
Water depth 30000 △ 50 + 40 = 15cm
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A cuboid water tank is 40cm in length, 30cm in width, 35cm in depth and 10cm in water depth. After putting a square iron block with 20cm in edge length, the water surface is high______ Cm

The bottom area of the water tank is 40 × 30 = 1200 (square centimeter), the volume of water is 1200 × 10 = 12000 (cubic centimeter), and the bottom area of the iron block is 20 × 20 = 400 (square centimeter). After the iron block is put in, the bottom area of the water tank becomes 1200-400 = 800 (square centimeter). At this time, the water surface is 12000 △ 800 = 15 (centimeter). A: the water surface is 15 cm high

When x = - 2 is known, the value of the cubic power + NX + 1 of the algebraic formula MX is 2009. When x = 2, the value of the cubic power + NX + 1 of MX is?
fast

x=-2
M(-2)³+N(-2)+1=2009
-8M-2N=2008
8M+2N=-2008
x=2
8M+2N+1=-2007

Solution inequality: 2loga (x-4) > loga (X-2)

When a ＞ 1, from 2loga (x-4) ＞ loga (X-2), we can get x − 4 ＞ x − 2 ＞ 0 (x − 4) 2 ＞ x − 2, and get x ＞ 6, so the solution set of the inequality is (6, + ∞). When 0 ＜ a ＜ 1, from 2loga (x-4) ＞ loga (X-2), we can get & nbsp; X − 4 ＞ x − 2 ＞ 0 (x − 4) 2 ＜ x − 2, and get 4 ＜ x ＜ 6, so the solution set of the inequality is (4, 6)

It is known that the two roots of the equation AX + BX = 0 (a is not equal to 0) are X1 and x2. Then a.x1 = x2 = 0, b.x1 = 0, X2 = B / A, c.x1 = 0, X2 = - B / A
D. X1 = B / A, X2 = - B / a which is right

Let's say x, (AX + b) x = 0; so X1 = 0, X2 = = - B / A, choose C

3 * 1.5 (6) is used for electric meters, and 3 * 10 (40) is used for some electric meters

1、 Model and its meaning. Watt hour meter model is expressed by letters and numbers, the contents are as follows: category code + group code + design serial number + derivative number. For example, our commonly used household single-phase watt hour meter: dd862-4, dds97l, ddsy97l, etc

Finding the zeros of F (x) = x ^ 3-3x

Let f (x) = x ^ 3-3x = 0
x（x²-3）=0
The solution is x = 0, X1 = √ 3, X2 = - √ 3

If the maximum voltage of a certain electrical appliance is 250V, can it be connected to the 220V lighting circuit

Of course, it can. Its maximum voltage is 250V, so as long as it is less than 250V
Generally, the rated voltage is 220 V, so the appliance works normally

Divide the following scores into 1 / 3 and 2 / X
thank you

One third is equal to one third of 3x
Two parts in x equals six parts in 3x