What simple arithmetic does decimal multiplication have

There is no algorithm for this, but you can use a decimal to multiply the integer part of another decimal, and then multiply the decimal part. It should be a little simpler. If you are not satisfied, you can go to the bookstore to have a look at the quick calculation book

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1. Cut the area of a circle into two sectors according to 2:7. The area of the large sector is 15 square centimeters more than that of the small sector. What is the area of the small sector?
2. A simple harmonic motion with a period of 4S and an amplitude of 2cm is made. From t / 8 to t, the distance of the particle motion is smaller than 7cm. Why How about the journey of one eighth cycle? What do you mean by 6 + (2-2sin45)?
3. Put two squares with 5cm sides together to form a rectangle. What's the perimeter and area of the rectangle?
4. What is the relationship between radius, linear velocity, angular velocity and period of a circle? And explain who decreases / increases with who increases
5. A sector with radius of 15 and center angle of 216 ° is rolled into the side of a cone, and the height and volume of the cone are calculated
6. How to get rid of brackets in mathematical algebraic expressions? How to change symbols? For example: - (A5 [power] - 6B) - (7 + 3b)
7. Find the circumference of a circle with radius or diameter. Find the area of a circle with radius or diameter
8. The function f (x) = x3-x is known to decrease on (0, a) and increase on [a, + ∞). The value of a is obtained. The expert is requested to answer
9. If the function f (x) is an odd function defined on R and a decreasing function on the interval (negative infinity, 0), and f (x) = 0, then f (x)
10. Given that f (x) = X3 ax is a monotone increasing function on [1, + ∞), then the maximum value of a is______ ．
11. A circle passes through a (- 2,1), B (5,0) and the center of the circle is on the straight line x-3y-10 = 0 A circle passes through a (- 2,1), B (5,0) and the center of the circle is on the straight line x-3y-10 = 0
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18. If a is rational, then - a must be negative? Why?
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