If 2x ^ 3Y ^ n and - 5x ^ my ^ 2 are of the same kind, then M =? N =?

If 2x ^ 3Y ^ n and - 5x ^ my ^ 2 are of the same kind, then M =? N =?

m=3 n=2

If the monomials x ^ 8y and (2x ^ a) ^ 2 * (3Y ^ BX ^ 4) are of the same kind, find the product of the two monomials

The exponents of X and y are equal, 8 = 2A + 4 and 1 = B, respectively,
So the product of two monomials = 12x ^ 16 * y ^ 2

(1) At night, when you walk along the road and pass a lamp, how does your shadow change
A. Gradually longer B, gradually shorter C, first longer then shorter D, first shorter then longer
(2) The following examples do not show that light propagates in a straight line in the same substance
A. Small hole imaging B, the formation of solar and lunar eclipses C, the formation of shadows D, from the water oblique view, the chopsticks inserted in the water become upward curved

1D that's common sense
Since 2D is curved, it is not a straight line

The base and area of a triangle are equal to those of a parallelogram. The height of parallelogram is 10cm, and the height of triangle is ()
A. 10cmB. 20cmC. 5crn

Let the height of triangle be H1, the height of parallelogram be H2, because H1 = 2S △ a, h2 = s △ a, so h2 = 12h1, so the height of triangle is twice that of parallelogram, and the height of triangle is: 10 × 2 = 20 (CM)

How to calculate 4.8-3.62-0.38 simply?

4.8-（3.62+0.38）

69.12÷3.6+69.12÷6.4 35×0.5+65÷2 0.96×9.9+0.96×0.1
（61.2-61.2×0.9）÷0.25 7.89-（3.27+2.89） （52.9-3.3）÷（80×0.25）

69,12÷(3.6+6.4)=6.912 (35+65)X0.5=50 0.96x(0.9+0.1)=0.96
[61.2-(1-0.9)]x4=24.48 7.89-2.89-3.27=1.73 49.6÷20=2.98

In the parallelogram ABCD, BC = 2Ab extends both ends of AB and intercepts AE = AB = BF, CE intersects AB at point G, DF intersects BC at point h, and finds the position relationship between CG and DH

Connect GH, DH and CG at point P
∵ quadrilateral ABCD is parallelogram
∴AD∥BC,AB∥CD
AD＝BC,AB＝CD
∴∠E＝∠DCG,∠F＝∠CDH
∵AE＝AB
∴BE＝BC
∴∠E＝∠BCE＝∠DCG
∵BF＝AB
∴AF＝BC＝AD
∴∠F＝∠ADF＝∠CDH
∵∠ADC＋∠BCD＝180°
∴∠CDP＋∠DCP＝90°
∴∠DPC＝90°
That is CG ⊥ DH

The mass of the earth is 6.0 * 10 ^ 24kg, and the distance between the earth and the sun is 1.5 * 10 ^ 11m
The motion of the earth around the sun can be regarded as uniform circular motion. What is the gravity of the sun on the earth?

ω=θ/t=2π/365×24×60×60=π/15768000
a=ω^2×r=(π/15768000)^2×1.5×10^11≈6.033×10^-4×π^2（m/s^2）
F=ma=6.0×10^24×a
Finally, it is about 3.569 × 10 ^ 22 n
With so many symbols, I fainted

The surface area formula and volume formula of the cylinder, the surface area formula and volume formula of the cone are in these books. What I want is π R & # 178; and so on. I want dictation tomorrow - better with Chinese characters and π R or something-

Surface area of cylinder = perimeter of bottom surface × height + area of bottom surface × 2
S = C H + 2πR²
= 2πRH + 2πR²
= πDH + 2π（D÷2）²
Volume of cylinder = bottom area × height
V = SH = πR²H = π（D÷2）²H

A rectangular piece of land, the perimeter is 48 meters, the width is half of the length, the area of this piece of land is how many square meters

If the width of the rectangle is x meters, the length is 2x meters
According to the meaning of the title: x + 2x + X + 2x = 48
6x=48
x=8
Then width = x = 8m, length = 2x = 16m
The area is 16 × 8 = 128
A: the area of this land is 128 square meters