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The idiom "Mao" and "Jiao" begin with animals
very rare
1002 955 908 8515 8013 752 704 651 601 average
One more
1004 956 907 5510 8015 753 703 652 601
100 2 95 5 90 8 85 15 80 13 75 2 70 4 65 1 60 1
(100×2+95×5+90×8+85×15+80×13+75×2+70×4+65+60）÷（2+5+8+15+13+2+4+1+1）
=83.62745---
1004 956 907 8510 8015 753 703 652 601
(5510 should be 8510)
(100×4+95×6+90×7+85×10+80×15+75×3+70×3+65×2+60）÷（4+6+7+10+15+3+3+2+1）
=83.82352---------
How to do 5x + 25 = 2x + 67
(5-2)x=67-25
3x=42
x=14
A very interesting book
This is a very interesting book
Why does a cat fall from the sky?
Cats have a well-developed balance system and a perfect body protection mechanism. When a cat falls from the air, no matter at the beginning, even if the cat's back is down and its feet are up, in the process of falling, the cat can always turn around quickly. When it approaches the ground, its forelimbs are ready to land, The tail of a cat is also a balance organ, just like the tail of an airplane, which can keep the body in balance
What number is the question mark?
Question 1 18
Question 2 15
ditto
Xiao Gang and Xiao Ming run 100 meters. Their speed remains the same. After Xiao Ming runs 90 meters, Xiao Gang has 25 meters left. When Xiao Ming reaches the finish line, how many meters does Xiao Gang have left
50 / 3 meters left
After Xiaoming runs 90 meters, Xiaogang has 25 meters left, which means Xiaoming runs 75 meters after 90 meters. Xiaoming only needs to run another 10 meters to the finish line. In this time, Xiaogang runs 75 / 9 = 25 / 3 meters. Xiaogang has 25-25 / 3 = 50 / 3 meters left
The sum of a natural number and its reciprocal is 5.2______ ．
2 into a fraction is 515515 = 5 + 15, 5 × 15 = 1; so the natural number is 5
How can three five and one be equal to twenty-four?
5*（5-1/5）
How many ways can a 40 cm long, 20 cm wide rectangular sheet iron be welded to a 5 cm deep uncovered rectangular iron box? Which one has large volume? Draw a picture
40-5 * 2 = 30cm 20-5 * 2 = 10cm
There are two kinds: length 30 cm, width 10 cm, height 5 cm or length 20 cm, width 20 cm, height 5 cm
When length = width, the maximum bottom area is length = width = (30 + 10) / 2 = 20cm
Maximum volume 20 * 20 * 5 = 2000 CC
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