The perimeter of a rectangle is 24cm, and the ratio of length to width is 5:1. What is the area of the rectangle?

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• 1. 1. It is known that the equation A & # 178; X & # 178; + (2a-1) x + 1 = 0 has two real number roots x1, x2. (1) when a is what value, x1 ≠ x2; (2) whether there are real number roots which are opposite to each other? If so, find out the value of a; if not, explain the reason
• 2. (+ 7 3 / 4) + (- 5 11 / 11) + (- 3 1 / 4) + (- 6 5 / 11) + (+ 17 1 / 4) + (+ 1 1 1 / 4)
• 3. How many hours is three hours and nineteen minutes?
• 4. What is the relationship between the zeros of functions and the roots of equations?
• 5. How to solve the equation with 1 / 14:5 = 3 / 7: x?
• 6. How to solve the equation 3x + (100-x) △ 3 × 1 = 100
• 7. On the inequality 2x + m of X
• 8. In Cartesian coordinates, the symmetric point of point a (5,0) about the origin is C 1. Please write the coordinates of point C directly 2. If point B is in the first quadrant, angle OAB = angle oba, and the symmetric point of point B about origin o is point D Judging the shape of quadrilateral ABCD (to be proved)
• 9. 3. The slope of the line 3x + 4y-12 = 0 is - the intercept on the y-axis is——
• 10. (5.87+1514+2.13+914)×(234−1.75)+(1÷27−3.5)×3.99．
• 11. How to use dash in English we kown that she tried to learn about every thing she found--I believe she would have much to say about the many countries she lived in. Why change a dash to a semicolon?
• 12. Simplification and calculation Calculate that the square of a minus the square of B plus the square of 2B minus 1 / a minus the square of B plus a plus B, where a plus B equals 2000
• 13. The diameter of circle a is 8 cm, which is 40% of the diameter of circle B______ Cm
• 14. Given that the area of parallelogram ABCD is 4 and O is the intersection of two diagonals, then the area of △ AOB is______ ．
• 15. Put a square with a side length of 1cm horizontally in turn to form a rectangle. Like this, use M squares to form the circumference of the rectangle
• 16. A store sells a commodity with a purchase price of 8 yuan at 10 yuan per piece, which can sell 200 pieces per day. Now it adopts the method of raising the selling price and reducing the purchase quantity to increase the profit. It is known that the daily sales volume of this commodity will decrease 10 pieces per day when the price increases by 0.5 yuan. If the commodity is to make a profit of 640 yuan per day, how much should the selling price be?
• 17. A store sells a certain commodity with a purchase price of 8 yuan at 10 yuan per piece, which can sell about 100 pieces a day. A store wants to increase its profit by reducing the selling price and increasing the sales volume. Through market research, it is found that the sales volume of this commodity can increase about 10 pieces for every 0.1 yuan decrease in the unit price of this commodity. How much yuan can reduce the selling price of this commodity to maximize the sales profit?
• 18. A store sells a commodity with a purchase price of 8 yuan at 10 yuan per piece, and it can sell about 100 pieces a day. The store wants to increase its profit by reducing the selling price and increasing the sales volume. After market research, it is found that the sales volume of this commodity can increase about 10 pieces with a decrease of 0.1 yuan per unit price. In order to maximize the sales profit, it is necessary to reduce the selling price of this commodity______ Yuan
• 19. If a store sells a commodity with a purchase price of 8 yuan at 10 yuan per piece, it can sell 200 pieces per day. Now it increases the selling price to make more profits. It is known that the sales volume of the store will decrease by 10 pieces for each price increase of 0.5 yuan. When we set the selling price, we can make the maximum profit per day? What is its maximum profit?
• 20. 1.4 times the square of x minus 25y is equal to? （ 1/4*x^2-25y^2 ) 2. The square of (x + y) minus the square of Z (x+y)^2-z^2 3.2ab-a^2-b^2 4.x^2*y^2+1-2xy