The perimeter of a rectangle is 48 decimeters, and its length is twice its width. What's the area of a rectangle

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• 1. It takes 65 seconds for a train to cross the 990 meter bridge. It takes only 15 seconds for a train to pass through a pole at the same speed. What's the speed of the train What is its total length
• 2. As shown in the figure, in ladder ABCD, ad ‖ BC, e is the midpoint of CD, AE ⊥ be, ab = AD + BC
• 3. The price of taxi in a city is: 5 yuan for less than 3 km (including 3 km), 1 km for more than 3 km (1 km for less than 1 km) It costs 1.2 yuan. Xiaoxiao takes a taxi from home to the gymnasium for 7.3 kilometers. How much does Xiaoxiao pay?
• 4. Pull the rectangle nailed with wooden strips into a parallelogram, its area () A. Bigger B. smaller C. unchanged
• 5. 【1】 The chemical fertilizer plant has several tons of chemical fertilizer in stock. The first shipment is 6 tons less than 25% of the total. The second shipment is 60% of the total. At this time, there are 36 tons left. How many tons of chemical fertilizer were in stock? 【2】 A basket of apples weighs 54 kg, one third of the total number sold in the first time, and the remaining 60% sold in the second time. How many kg are left in the basket? 【3】 For two adjacent odd numbers, the decimal is 40% smaller than the large number, and the product of these two odd numbers is ()
• 6. 1. There are 270 people in the three engineering teams of Party A, Party B and Party C. due to the need of work, 15 people are drawn from each team of Party A and Party B to team C. at this time: A: B: C = 1:3:2, how many people are there in team B? 2. The number of trees planted by a, B and C is one half of that of B, C and C. the number of trees planted by B is one third of that of a, C and C. It is known that 130 trees have been planted by C. how many trees have been planted by a? 4. During the promotion period, the price of a piece of clothing will decrease (1 / 11). If the activity ends and the original price is restored, how much will the price increase? 5. A batch of parts are packed in boxes. When they are packed in 10 boxes, only 16 / 25 of them are packed. The remaining parts are only enough for 5 boxes and 20 more. How many parts are there in this batch?
• 7. If ABC is known to be the trilateral length of △ ABC and the absolute value of A-B plus the absolute value of B-C = 0, then ABC is a triangle
• 8. If three sides a, B, C of △ ABC satisfy a & # 178; + B & # 178; + C & # 178; + 338 = 10A + 24B + 26c, then s △ ABC=
• 9. It is known that in △ ABC, the opposite sides of ∠ a, B and C are a, B and C respectively, and satisfy the following conditions: A & # 178; + B & # 178; + C & # 178; + 338 = 10A + 24B + 26c, Try to judge the shape of △ ABC
• 10. If three sides ABC of triangle ABC satisfy (a-5) & sup2; + (B-12) & sup2; + C & sup2; = 26c-169, the shape of ABC is judged
• 11. In the past, it took 8 hours for a workshop to produce 1200 parts. After the technical innovation, it took only 6 hours to complete the task, and the work efficiency increased by several percent
• 12. In diamond ABCD, the angle B is equal to the angle EAF is equal to 60 degrees, the angle Bae is equal to 25 degrees, and the degree of the angle CEF is calculated
• 13. 1+2+3+4+5+6…… How much does it add up to 10000? The result is calculated
• 14. 1+2+3+4+5+…… +100 = how much
• 15. The second power of 2-0 is equal to 4, equal to 1 * 4, the second power of 4-2 is equal to 12, equal to 3 * 4, the second power of 6-4 is equal to 20, equal to 5 * 4 What rule do you find? Write numbers in letters
• 16. Given that a square plus b square equals 25 and a × B equals 12, find the square of (1) a + B and (2) a-b
• 17. How much plus 0.25 divided by 3.5 times 4.8 divided by 0.8 equals 1.2
• 18. What is (- 0.5) + 3 and 1 / 4 + 2.75 + (- 5 and 1 / 2)?
• 19. What is 3 + 1-5 + 0-0 + 4
• 20. 3, if the sum of the first n terms of the equal ratio sequence {an} is Sn = 3 ^ n + A, then a is an=sn-sn-1=2x3 n-1 ,a1=s1 ,2=3+a ,a=1 The answer is - 1 or 1,