Super simple math problems, oh, yes`` Simplify the following comparison is OK, please 5:0.35 7.5:10 39/52 2/3:1/2 6.3/0.9 Simplify the following comparison, please 5:0.35 7.5:10 39/52 2/3:1/2 6.3/0.9 For example: 16:20 = 16 △ 20 = 16 / 20 = 4 / 5

Super simple math problems, oh, yes`` Simplify the following comparison is OK, please 5:0.35 7.5:10 39/52 2/3:1/2 6.3/0.9 Simplify the following comparison, please 5:0.35 7.5:10 39/52 2/3:1/2 6.3/0.9 For example: 16:20 = 16 △ 20 = 16 / 20 = 4 / 5

5:0.35=(5*100):(0.35*100)=500:35=(500/5):(35/5) =100:77.5:10=(7.5*10):(10*10) =75:100=(75/25):(100/25)=3:439/52=(39*13):(52*13)=3:42/3:1/2=(2/3*6):(1/2*6)=4:36.3/0.9=(6.3*10):(0.9*10)=63:9=(63/9):(9/9...

4 and 2 / 3 hours = () hours () minutes

4 and 2 / 3 hours = (4) hours (40) minutes

Super simple math problem
What is the vertex coordinate of parabola y = 1 / 9x ^ 2-1?
If (m, 0) is on its image, what is m
There should be a process

A = 1 / 9, B = 0, axis of symmetry x = - B / 2A = 0 (vertex on axis of symmetry)
Substitute x = 0 into the parabola to get y = - 1, so the vertex coordinates are (0, - 1)
(m, 0) is on the image, so y = 0 is substituted into the parabolic equation
Get 1 / 9x ^ 2-1 = 0, find M = 3 or - 3

Who's going to help?
Xiaojie is 12 years old and his mother is 36 years old. Will Xiaojie be two-thirds of his mother's age? If possible, write a few years ago or a few years later
30 before 9:30, 20 before 10:00,

Let's assume it's possible
After X years, it is 2 / 3 of mother's
Then 12 + x = (36 + x) * 2 / 3
12+x = 24 + 2X/3
X/3 = 12
X = 36
So 36 years later, Xiaojie's age is 2 / 3 of his mother's

(x + y) & # 178; - 2 (x + y) (X-Y) + (X-Y) & # 178; (requirement: specify the reason and the simplest method)

(x + y) & # 178; - 2 (x + y) (X-Y) + (X-Y) & # 178; [the direct inverse uses the complete square formula (a-b) & # 178; = A & # 178; - 2Ab + B & # 178;, where a = (x + y), B = (X-Y)]
=[(x+y)-(x-y)]²
=[2y]²
=4y²

A few math problems, very simple
(1) Xiaojie takes 8 / 15 hours to walk 8 / 9 kilometers. How many kilometers can he walk at this speed in 2 hours?
(2) After reading a book in 4 days, I read 2 / 9 of the whole book on the first day, 1 / 6 of the whole book on the second day, 1 / 4 of the whole book on the third day, and how much of the whole book on the fourth day?

(1) Xiaojie takes 8 / 15 hours to walk 8 / 9 kilometers. How many kilometers can he walk at this speed in 2 hours?
The speed is: 8 / 9 / [8 / 15] = 5 / 3
Two hour walk: 5 / 3 * 2 = 10 / 3km
(2) After reading a book in 4 days, I read 2 / 9 of the whole book on the first day, 1 / 6 of the whole book on the second day, 1 / 4 of the whole book on the third day, and how much of the whole book on the fourth day?
On the fourth day: 1-2 / 9-1 / 6-1 / 4 = 13 / 36

1.15/(-4)=15*_______
2.-3/7/(-3/5)=-3/7*________
3.-3/(-1/2)=-3*_________ =3*_________
/=Except
*=By

Wrong upstairs
1.-1/4
2.-5/3
3.-2 ,2

A few simple math problems
1、 How to compare the size of 2 - √ 3 and √ 3 / 2
2、 Point P (x, y), if x = 0, then point P (x, y) is on the X / y line
3、 Given that point a (2,3) AC is perpendicular to the x-axis and C is perpendicular, the coordinates of point C are as follows:
If the coordinates of the four known points P are (2a-a, 3A + 6), and the distances from the point P to the two coordinate axes are equal, the coordinates of the point P can be obtained

1、 2 - √ 3 - √ 3 / 2 = (4-3 √ 3) / 2
4=√16,3√3=√27
√16

① Root number 3 / 3 root number 27 minus root number 12
② (2 times root 3 minus root 5) (2 times root 3 plus root 5)
③ (2x minus 1) square (2) minus (2x plus 1) (2x minus 1)
④ (root 2 minus 1) zero power (0) plus 8 times root 1 / 2 minus root 2
⑤ (2 times root 5 minus root 2) square (2)
⑥ 1 / 2 root number 24 minus root number 216 plus 3 times root number 1 / 6

Write your title again, I can't understand it!

Help to do some math problems,
1. A cone bottom radius 4 DM, height 10 DM, volume
2. The lengths of the two right sides of a right triangle are 4cm and 3cm respectively. If the side with the length of 4cm is rotated for one circle, a cone can be obtained. What is the volume of the cone in cubic centimeter?
3. The volume of the cone is 47.1 cubic centimeter, the diameter of the bottom surface is 6cm, and what is the height of the cone?
4. The inner diameter of the water pipe is 2cm, and the flow rate of water in the pipe is 8cm per second. A student went to the pool to wash his hands and forgot to turn off the tap when he left. How many liters of water would he waste in five minutes?
Please write down the process. I'm very lazy

1. According to the conic volume formula "V = 1 / 3 × bottom area × height"
The volume of the cone is 1 / 3 × 3.14 × 16 × 10 = 167.47 (cubic decimeter)
2. According to the meaning of the title, the radius of the circle on the bottom of the cone is 3cm and the height is 4cm,
According to the conic volume formula "V = 1 / 3 × bottom area × height"
The volume of the cone is 1 / 3 × 3.14 × 9 × 4 = 37.68 (cm3)
3. From the diameter of the bottom surface 6cm, the radius is 3cm,
According to the conic volume formula "V = 1 / 3 × bottom area × height"
1 / 3 × 3.14 × 9 × H = 47.1, the height is 5cm
4. The shape of the water pipe is a cylinder, and the radius of the bottom of the cylinder is 1cm,
The height of the cylinder is 5 × 60 × 8 = 2400cm according to the water velocity of 8cm / s and 5min
From the cylinder volume formula "V = bottom area × height", 5 minutes will waste water
3.14 × (square of 1) × 2400 = 7536 (cm3)
5 minutes from 1 cc = 0.001 liter will waste 7.536 liters of water