A car travels 60 kilometers per hour, 2 / 13 faster than a motorcycle. How many kilometers per hour does a motorcycle travel? Two methods are required: equation and arithmetic

A car travels 60 kilometers per hour, 2 / 13 faster than a motorcycle. How many kilometers per hour does a motorcycle travel? Two methods are required: equation and arithmetic

Equation:
Set up a motorcycle to travel x kilometers per hour
x*(1+2/13)=60
x=52
Arithmetic:
If we take the speed of motorcycle as unit 1, then the speed of car is 1 + 2 / 13, because unit 1 is unknown
60 divided by (1 + 2 / 13) = 52 km
A: the motorcycle runs 52 kilometers per hour

The difference between a and B is 9. If one sixth of a is equal to one fourth of B, what is a and B/
emergency

Let a X. B y
X-Y=9
X/6=Y/4
The solution is x = 27, y = 18

How much sodium hydroxide and water are needed to prepare 500 ml 10% sodium hydroxide solution (density is 1.1 g / cm3)?

To prepare 500ml (500cm3) sodium hydroxide solution with 10% mass fraction, the mass of sodium hydroxide is 500cm3 × 1.1g/cm3 × 10% = 55g; the mass of water is 500cm3 × 1.1g/cm3-55g = 495G. A: the mass of sodium hydroxide and water are 55g and 495G respectively

The development of the people's education press of mathematics test paper of unit 4 in Volume 1 of grade 6

Is it the lesson of comparison

4 + 2, 5 + 8, 6 + 14, 7 + 20,... Then the formula with the sum of 83 is (? +?) detailed process
The first floor is classic, but in essence, this question is about what problem in mathematics? (n + 3) + (6n-4) = 83 is based on what principle? Thank you. At the same time, it will be selected as the best answer
The second floor is also an expert

（n+3）+（6n-4）=83
7n=84
n=12
So 15 + 68
The plus sign is preceded by 4, 5 and 6. Let 4 be the first term. They increase by 1 each time, so they are n + 3
Xiang Tongli after the plus sign

Mathematics! Help me to see not much, only 6, is to fill in the blanks and calculation
If the point P (a + 3,7-a) is located on the bisector of the first quadrant, then the coordinate of point P is ()
It is known that if point a on Y-axis satisfies Ao = 2, then the coordinate of point a is ()
Solving inequality equations (with process)
1.2x-1>=5
x-511
2(x-3)>=3x-1
3.x/2-（2-x）/5≥-6
4.1/4（3-2x）＞1/2x＋10

Because P is on the angular bisector, so a + 3 = 7-a, so a = 2, we know P (5,5)
Ao = 2 and point a is on the y-axis, so point a (0,2)
1.2x-1>=5 x-5=6 x-5=3 3x=3x-1
1.8x=-8
4.1/4(3-2x)>1/2x+10
3/4-1/2x>1/2x+10
x

On mathematical problems of complete square formula~~
Given that x + 1 / x = 2, find the value of the following formula:
1. Square of X + 1 / 2 of X
2. The fourth power of X + one fourth power of X
Please write the process~
If you can, please give me a brief idea ~ ~ thank you^_^

1. Square of X + 1 / 2 of X
Square of X + 1 / 2 of X
= the square of (x + 1 / x) - 2 × x × 1 / X
= the square of 2-2
＝4－2
＝2
2. The fourth power of X + one fourth power of X
The fourth power of X + the fourth power of X
= (square of X + 1 / 2 of x) - square of 2 × x × 1 / 2 of X
= the square of 2-2
＝4－2
＝2

Divide a number by a number = 58, divide 6 by 2

412 / 7 = 58 + 6
644 / 11 = 58 + 6
760 / 13 = 58 + 6
992 / 17 = 58 + 6
1108 / 19 = 58 + 6
30682 / 23 = 58 + 6
.

A good word and a good sentence for a gazelle
It's better to attach the feeling after reading, 200 words. The fuller the answer, the better!

Sad cliff is a peak of Jialuo mountain. It is like being cut from the middle by a sharp axe

What's the motto or proverb that comes to mind after reading the riddle in the valley in Lesson 17, Volume 2, grade 6?

Sometimes bending is not surrender and destruction, but for survival and better development
Natural selection, survival of the fittest
Take a step back, the sea is wide and the sky is wide
A man can bend and stretch