Xiao Ming does ten math problems. Is there a positive proportion between the problems he has done and the problems he has not done,

Xiao Ming does ten math problems. Is there a positive proportion between the problems he has done and the problems he has not done,

Xiao Ming does ten math problems. The problems he has done and the problems he hasn't done can't make up a proportion
Because the problem that has been done + the problem that has not been done = the total problem that needs to be done (certain), because it is and certain, not a certain ratio, so it cannot form a proportion

1.3, 5.7, 9, 11.13, 15, 17, 19, in this order, how many rows are 2011?

a(n)=2*n-1;
a(n)=n*2-1=2011 => n=1006
k=1 1
k=2 3 5
k=3 7 8 9
.
k=s .
k=s+1 ...n.
n(s)=(1+2+3+...+s)=(1+s)*s/2s^2+s-2012 0

The weight of the elephant is 72000 n. the area of each foot is 600 square centimeter. When the three feet of the elephant touch the ground, what is the pressure and pressure on the ground

Pressure equals gravity f = 72000n
Pressure is equal to gravity divided by force area p = f / S = 72000 / (3 * 600 / 10000) = 400000pa

A cuboid water tank of 50 cm long, 40 cm wide and 25 cm high is filled with water 15 cm deep. How many centimeters can the water surface rise when a cube iron block with 10 cm long edges is immersed in the water?

10 × 10 × 10 ^ (50 × 40) = 0.5cm

Can you quickly find the sum of 2 + 6 + 10 + 14 + 18 + 22 + 26 + 30 by using the operation law of addition

=(2+30)+(6+26)+(10+22)+(14+18)
=32+32+32+32
=128

1 square meter = () square decimeter = () square centimeter?

1 square meter = (100) square decimeter = (10000) square centimeter

Five science and technology books cost 16 yuan more than three story books. It costs 29 yuan to buy the same four science and technology books and three story books

Five science and technology books cost 16 yuan more than three story books, so three stories = five science and technology books - 16 yuan
Four science books and three story books cost 29 yuan in total
4 science and technology books + 5 Science and technology books - 16 = 29
9 science and technology books = 45
1 science and technology book = 5 yuan
25-16=9
9/3=3
Story book 3 yuan

Question 1: how many minutes after the pointer points to 4, the hour hand coincides with the minute hand? Question 2: between 6 o'clock and 7 o'clock, when does the minute hand coincide with the hour hand?

20 (1-1 / 12) = 21 and 9 / 11
From the pointer to 4, after 21 and 9 / 11 minutes, the hour hand coincides with the minute hand
30 (1-1 / 12) = 32 and 8 / 11
Between 6 o'clock and 7 o'clock, the minute hand and the hour hand on the clock coincide at 32 and 8 / 11

78t = () kg, 8kg, 600g = () kg, 1m = () km, 1cm = () m, 30min = (), 1m2 = () m2
04 km = () km () m, 360 min (), 1 g = () kg, 1 kg = () t, 15 seconds = () min, 1 square centimeter = () square decimeter

3.78 tons = (3780) kg,
8 kg 600 g = (8.6) kg,
1m = (0.001) km,
1 cm = (0.01) m,
30 = (0.5),
1 square decimeter = (0.01) square [meter]
5.04 km = (5) km (40) m,
360 points (6),
1 g = (0.001) kg,
1kg = (0.001) t,
5 seconds = (1 / 12) minutes,
1 square centimeter = (0.01) square decimeter

Cough:_____ Please come in and help me solve the problem of preview of Lesson 18 "beauty across a hundred years" in Grade 6 Chinese volume 2
1. Collect information about Madame Curie
2. The Pinyin of the new characters (AI, Lun, Teng, Xi, Jian, Wan, Zhuo, Xiao, AI, que, Yu, Lian, Du, CI) is the same as that of the group words
3. Find out where the beauty is in the sentences
4. Draw the sentences you feel most deeply, make comments, and talk about your own experience (- - 1 sentence or 2 sentences are OK)
Thank you very much. If you answer well, you will get extra points!

1. Marie Curie (1867.11.7-1934.7.4), a famous scientist in the world, studied radioactive phenomena and discovered radium and polonium (P ō), two natural radioactive elements. She won the Nobel Prize twice in her life (the first Nobel Prize in physics and the second Nobel Prize in Chemistry)