Newton's second law is

Newton's second law is

Formula: fhe = MA1. Law content: the acceleration of an object is directly proportional to the combined external force F on the object and inversely proportional to the mass of the object. The direction of acceleration is the same as that of the combined external force. 2. Formula: fhe = Ma3

2x-8.2=1-0.3x

2x-8.2=1-0.3x
2x+0.3x=1+8.2
2.3x=9.2
x=9.2÷2.3
x=4

The perimeter of a rectangle is 260 cm. If the length is reduced by 1 / 8 and the width is increased by 1 / 5, a rectangle with equal perimeter will be obtained, and the area of the original rectangle will be calculated
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One eighth of the length is equal to one fifth of the width
The perimeter is 260, so the width is 130,
Then, 1 / 13 of the length is 10, that is, 1 / 8 of the length is 10, and 1 / 5 of the width is 10
So the length and width of the original rectangle are 80 and 50 respectively
The area is 4000

Ningbo Taizhou Wenzhou Railway was officially put into operation on October 1, 2009. The total length of Ningbo Taizhou Wenzhou Railway is 275 km. The preset running speed of "harmony" EMU can reach 200 km / h to 250 km / h. It used to take 3 hours from Ningbo to Wenzhou, but now it only takes 1 hour and 40 minutes. Please reply according to the above data: calculate the average speed of EMU from Ningbo Station to Wenzhou station

According to the meaning of the question, t = 1H, 40min = 53h, s = 275km, substituting into the average speed formula v = st = 275km, 53h = 165km / h; answer: the average speed of EMUs from Ningbo Station to Wenzhou station is 165km / h

Solution equation: 4x + 3 (2x-3) = 12 - (x + 4)

Remove the brackets, 4x + 6x-9 = 12-x-4, transfer the term, 4x + 6x + x = 12-4 + 9, merge the similar terms, 11x = 17, coefficient into 1, x = 1711

Cut the biggest circle out of a long hair paperboard 8 cm long and 4 cm wide. How much less is the area of the circle than that of the rectangle?

Circle area = 3.14 × (4 △ 2) &# 178; = 12.56 square centimeter
Rectangle area = 8 × 4 = 32 square centimeter
So the area of the circle is less than that of the rectangle (32-12.56) △ 32 = 60.75%
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The symbol "^" is often used in mathematical formulas,
What does this symbol stand for?

For example, 5 ^ 2 means the square of 5. The sign means the power of several

If the sum of 3 / 4x ^ [5m + 2n + 2] y ^ 3 and - 4 / 3x ^ [6] y ^ [3m-2n-1] is a monomial, find the value of M, n

5m+2n+2=6
3m-2n-1=3
It is necessary to solve this system of equations
m=1
n=-1/2

If the side area of the cone is 6R and the perimeter of the bottom surface is 2R, then the length of the generatrix is?

Let the center angle of the expanded cone be q and the length of its generatrix be l, then:
The side product of cone s = (Q * L ^ 2) / 2 = 6R, L ^ 2 represents the square of L
Bottom perimeter L = Q * l = 2R
The length of the bus is 6

A number divided by three, the remainder is two, divided by four, the remainder is one, then how much is this number divided by 12? (please check after finishing)

It can be seen from the original question
3a+2=4b+1
3(3+3)-7=4(b+2)-7
So this number is 12n-7
(12n-7) / 7 the remainder of the result is 5