Math! Solve the problem of proportion! Big rabbit toy,42cm small rabbit toy is made according to 1:6, how tall is the small rabbit? A batch of washing machine parts, originally planned to produce 40 per hour,30 hours to complete, the actual production of 50 per hour, the actual hours to complete? Xiao Ming reads 200 pages of a book. He has read 80% of the book in the first four days. How many days will it take to read the book? The circle diameter is 2cm, the small circle diameter is 1cm. Draw a screenshot of a machine part according to the scale of 1:10. What is the actual screenshot of this part?

Math! Solve the problem of proportion! Big rabbit toy,42cm small rabbit toy is made according to 1:6, how tall is the small rabbit? A batch of washing machine parts, originally planned to produce 40 per hour,30 hours to complete, the actual production of 50 per hour, the actual hours to complete? Xiao Ming reads 200 pages of a book. He has read 80% of the book in the first four days. How many days will it take to read the book? The circle diameter is 2cm, the small circle diameter is 1cm. Draw a screenshot of a machine part according to the scale of 1:10. What is the actual screenshot of this part?

1
Set rabbit height xcm
42: X =1:6
X =252

2
Set: Actual x hours completed
40:50= X:30
X =24

3
Assume common x days
200*80%=160
160:4=200: X
X =5

4
Let the actual diameter be x cm and the actual small circle y cm
2: X=1:10
X =20
1: Y=1:10
Y =10
Answer: Big circle 20cm, small circle 10cm

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How to express the 100th power of 2.5 by the 102th power of 4 by scientific counting method.(-40) by the 101st power of (0.25) by the 102th power.

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