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The usage of several buttons on the electronic calculator CE MRC M- M+ There's another Ms And MC
Some standard models have digital storage function, which includes four keys: MRC, M -, M + and mu. After inputting a number, press m + to read the number into memory. After that, no matter how many steps are carried out, just press MRC once to read the previously stored number, press m - to delete the number from memory, or press twice MRC.MU For the benefit of
Differential of high number y = x / (x ^ 2 + 1) ^ 1 / 2
For example, y is equal to the differential of X of the root sign (the square of x plus 1),
Dy = [1 / (x ^ 2 + 1) ^ (2 / 3)]
Eat, wait and see.
∵y=x/(x^2+1)^（1/2）∴dy=d[x/(x^2+1)^(1/2)] =[x/(x^2+1)^(1/2)]′dx ={[(x^2+1)^(1/2)-x^2/(x^2+1)^(1/2)]/(x^2+1)}dx ={[(x^2+1)-x^2]/[(x^2+1)^(3/2)]}dx =[1/(x^2+1)^(3/2)]dx =dx/(x^2+1)^(3...
Given that a, B are opposite numbers, C and D are negative reciprocal numbers, the absolute value of X is equal to twice of its opposite number, the value of x 3 + abcdx + a-bcd is obtained
From the known formula: a + B = 0, CD = - 1, | x | = - 2x, we can get x = 0, the original formula = 0-ab × 0 + A + B = a + B = 0
How to get 24 by adding, subtracting, multiplying and dividing the four numbers 5, 1, 1 and 1
It's not 5, 5, 5, 1
5^(1+1)-1
1 + 1 power of 5 - 1
Given two functions of degree Y1 = - x + 3, two functions of degree Y1 = - x + 3, y2 = 3x-4, when x takes what value, Y1 > Y2? When x takes what value, Y1 > Y2
(1) When Y1 > Y2,
That is - x + 3 > 3x-4,
4X＜7
X＜7/4
(2) When y17
X>7/4
There is a circular fountain on the campus of the experimental primary school, covering an area of 78.5m2. Now it is necessary to expand the fountain. After the expansion, it is planned to cover an area of 153.86m2. How much should the diameter of the fountain be increased?
The original radius of the spray tank is r m, and the radius of the expanded spray tank is r m, 3.14 × R2 = 78.53.14 × R2 △ 3.14 = 78.5 △ 3.14 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; R2 = 25 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp
1 11 12 1 3 is 24 o'clock
Urgent need
13 minus 11 equals 2
2 times 12 is 24
24 times 1 is 24
The curvature of point (π / 2,1) on the curve y = SiNx is
The curvature of the point (π / 2,1) on the curve y = SiNx is 0
The volume of a hydrogen balloon in the suspended air is 1500m ^ 3, the load is 1.75 * 10 ^ 4N, and the known air density is 1.29kg/m ^ 3
A hydrogen balloon suspended in the air has a volume of 1500m ^ 3 and a load of 1.75 * 10 ^ 4N. Given that the air density is 1.29kg/m3, then the buoyancy of the hydrogen balloon in the air is_____ N. The balloon itself is heavy______ N. (g = 10N / kg)
F floating = ρ gas GV row = 1.29 × 10 × 1500 = 1.935 × 10 ^ 4N
G balloon = f float-g load = (1.935-1.75) × 10 ^ 4 = 1.85 × 10 ^ 3N
Please check by yourself
It is known that the two bottom surfaces of a 30 cm high regular hexagonal prism are parallel to the projection plane. If the side length of its orthographic projection is 10 cm, what is the volume of the regular hexagonal prism?
The area of a hexagon is 150 times the root 3 times the height 30
Get 4500 root number 3 (cubic centimeter)
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