A kind of toy named "Ruoyu golden cudgel" is sold in a shop. Its length is 100cm and its bottom diameter is 4cm. A red plastic film with 80cm length is pasted on the middle part of the toy, and a yellow plastic film with 10cm length is pasted on both ends of the toy. How many square centimeters are needed to make such a "Ruoyu golden cudgel"?

1. Area of red plastic film: 3.14 × 4 × 80 = 1004.8 square centimeter
2. Area of yellow plastic film: 3.14 × 4 × (10 × 2) = 251.2 square centimeter

This year's wheat output has increased by 20% compared with that of last year, which means that this year's output is ()% of that of last year

20% = 20%
Last year's output was one unit. If we regard last year as 100 units, it will increase by 20% of 100. That is to say, this year is more than last year. This year, 100 + 20 = 120
120/100=120%
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This is a problem in the second volume of Mathematics for junior doctor of Century Golden list
When Martha does a subtraction problem, he writes 6 mistakes on the hundreds of the subtracted numbers as 9, 9 mistakes on the tens as 6, and 3 mistakes on the hundreds of the subtracted numbers as 5. The difference is 326,

First of all, we should have knowledge preparation, that is, if the subtracted number increases (decreases), the difference will also increase or decrease. If the subtracted number increases (decreases), the difference will decrease (or increase)

Remember the answers of Chinese and Mathematics for the little doctor of Century Golden list. It must be the second volume of fifth grade! Thank you!

"Wangjia" fruit supermarket brought in a batch of pears. On the first day, it sold 16% of the total number of pears. On the second day, it sold the remaining 25. On the third day, it sold 14% of the total number of pears, leaving 140 kg. How many pears did "Wangjia" fruit supermarket bring in?

140 △ 1-16 - (1-16) × 25-14, = 140 △ 56 − 56 × 25-14, = 140 △ 56-13-14, = 140 △ 14, = 560 (kg); a: 560 kg of pears were transported

If sin 2a is 1 / 2 + cos 2a is 1 / 2, then Tan 2a is 1 / 2
Which is the right one: 5 out of 4, 5 out of 4, 4 out of 3, 4 out of 3

That is, sin2a = 2 + 2cos2a square Sin & # 178; 2A = 1-cos & # 178; 2A = 4 + 8cos2a + 4cos & # 178; 2a5cos & # 178; 2A + 8cos2a + 3 = 0cos2a = - 3 / 5, cos2a = 1, then sin2a = 4 / 5, sin2a = 4, the second is left off, so tan2a = sin2a / cos2a = - 4 / 3

If the complex Z satisfies (I + AI) z = a + I, and the corresponding point of Z in the complex plane is above the x-axis, the range of a is obtained

(i+ai)z=a+i
∴ z=(a+i)/(i+ai)
=-a/(1+a)i +1/(a+1)
The corresponding points are (1 / (a + 1), - A / (a + 1))
The corresponding point of Z in the complex plane is above the x-axis
∴ -a/(a+1)>0
∴ a(a+1)

A car travels 80 kilometers per hour and a bus 65 kilometers per hour. What's the speed of the bus

The speed of the bus is 65 / 80 of that of the car

It is known that 3528a is just the square of natural number B. what is the minimum value of a? 35282 352821 is not a square

If a is 0-9, then:
√35280=187.82971010998
√35289=187.85366645344
It's not more than 188, so it can't be 0-9
If a is 10-99, then
√352810=593.97811407492
√352899=594.05302793606
It fluctuates between the natural number 594, so B = 594
So 594 squared = 352 836
So the minimum value of a is 36

What is the meaning of the nth power of a

The meaning of the nth power of a is the product of N a
Benefactor, I see your bones are strange,
He is a man of noble bearing and wisdom,
He is a unique talent in the Wulin
If you devote yourself to study, you will become a great tool in the future,
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