The perimeter of the rectangle is 10 meters, and the width is two fifths of the length. The area of the rectangle is () square meters, which can be used as a fraction

The area of this rectangle is (250 / 49) square meters

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1. A rectangle is five fifths of its length and three fifths of its width. What is its perimeter and area?
2. The area of the rectangle is 2 / 5 square meters, and the area of the shadow part is 2 / 5 of the area of the rectangle
3. The shadow accounts for two fifths of the triangle and three twentieth of the rectangle. The area of the triangle is 40 square centimeters less than that of the rectangle. What is the area of the rectangle
4. The area of the rectangle is two fifths of the area of the shadow part, and the area of the shadow part is two fifths of the area of the rectangle
5. As shown in the figure, the area of the rectangle is 70 square centimeters, the upper bottom of the trapezoid is 3 / 7 of the length of the rectangle, and the lower bottom is 4 / 5 of the length of the rectangle
6. The area of a piece of paper is four fifths of square meters. After folding it twice, how many square meters is the area of one of them? What about the third time? If B of a times m is less than m, then a is greater than or less than B
7. A piece of rectangular paper with an area of 2 square meters is folded in half for three times to get an area of? The rectangle obtained after folding three times is one eighth of the original rectangle and one fourth of its area. Why?
8. Fold a two fifths square paper into a rectangle with a circumference of () decimeters and an area of () square decimeters
9. Fold a 20 cm long, 16 cm wide rectangular paper in half for three times to get a rectangle. What's its area? Write the process clearly
10. A rectangular piece of paper is folded in half three times in a row. What is the area ratio of one piece of paper to the other
11. A rectangle is one fourth of a meter long and two fifths of a meter wide. Its perimeter is () meters and its area is () square meters
12. Vector a = (x1, Y1), vector b = (X2, Y2), a + B = (x1 + X2, Y1 + Y2), how to express a * B, is it equal to a + B
13. Given the function f (x) = ax-b / x-2lnx, f (1) = 0, Given the function f (x) = ax-b / x-2lnx, f (1) = 0 (1) If the function f (x) is a monotone function in its domain of definition, the value range of real number a is obtained (2) The slope of the tangent line of the image at x = 1 is 0, a (n + 1) = f '(1 / an + 1) - Nan + 1. If A1 > = 3, it is proved that an > = n + 2
14. The function formula of the price f (T) of a commodity in the last 30 days f (T) = t + 8 (0
15. (my blank space is to let you see the title better, and it is required to make simple calculation! I am very urgent! Do as much as you can.) 1. 1 + 2 of 1 + 1 + 2 + 3 of 1 + 1 + 2 + 3 + 4 of 1 + 1+2+… One in 99= 2. (1 / 11 + 1 / 21 + 1 / 31 + 1 / 41) * (1 / 21 + 1 / 31 + 1 / 41 + 1 / 51) - (1 / 11 + 1 / 21 + 1 / 31 + 1 / 41 + 1 / 51) * (1 / 21 + 1 / 31 + 1 / 41 + 1 / 51)= 471471471471÷157157157157=
16. Can we use parallelogram and triangle rules as long as it is a vector? Such as the title
17. Three points a (0,2,3), B (- 2,1,6), C (1, - 1,5) are known. If | a | = √ 3, and a is perpendicular to ab vector and AC vector respectively, then
18. As shown in the figure, △ ABC, ab = AC, D, e and F are the points on AB, BC and Ca respectively, and BD = CE, ∠ def = ∠ B
19. The problem in the program diagram of solving inequality ax + b > 0 1： Input a, B 2: a > 0? 3: Yes, output x > - B / a no, output X
20. In the square ABCD, e is the midpoint of BC, f is the point on CD, and CF = 14CD, try to judge whether △ AEF is a right triangle? Try to explain the reason