To make a wooden drawer that is 50cm long, 60cm wide and 20cm high, you should use at least () square decimeters of wood, and its volume is () liters

104 square decimeters 60 liters

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1. 1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+.+1/2021055 It's a bit difficult, but I hope you can help me
2. It is known that the value of square + 4x-2 of algebraic formula x is 3, 1. Find the square of the algebraic formula 2x + 8x-5 2. Find the value of the square of the algebraic expression - 3x - 12x - 1
3. Multiplication of two numbers equals addition of two numbers What's the trick?
4. Use the substitution method to solve the following equations, do not give the answer directly （1） 3x + 4y = 16 ① 5x - 6y = 33 ② （2）4（x-y-1）= 3（1-y）- 2 ① x/2 + y/3 =2 ②
5. Thank you
6. Why is 2 + 5 equal to 7000000? It seems that there is one more Rix. How can it be eliminated?
7. What does E-4 mean after the number in the calculator
8. How does 123456789 calculate equal to 99
9. How can 123456789 be equal to 555 If so, I can also know that each number can only be used once`
10. The main characteristics of electronic digital computer
11. Divisor divided by divisor equals quotient is 8, divisor + divisor + quotient equals 170, what is the divisor?
12. The radius of a circular fish pond is 8 meters, and there is a circular island in the middle with a diameter of 4 meters. The area of this fish farm is () square meters?
13. 8 minus 6 / 13 divided by 6 / 29 minus 1 / 3
14. If a and B are two unequal real roots of the equation x ^ 2 + 2x-2006 = 0, then the value of a ^ 2 + 3A = B is () A. - 2006 b.2006 c.2003 d.2004 If a and B are two unequal real roots of the equation x ^ 2 + 2x-2006 = 0, then the value of a ^ 2 + 3A + B is () A.-2006 B.2006 C.2003 D.2004
15. Use a simple method to calculate! （1）202²+198² 2）2005×20042004- 2004×20052005
16. Solve the equation 3x & # 178; + 2x = 7
17. Can the equation (2M2 + M-3) x ^ (M + 1) + 5x = 13 be a quadratic equation with one variable? The degree on X is m + 1
18. The first column is 1,4,9, the second column is 4,8,12, the third column is 5,10,15, and the fourth column is 10,12,14. What is the second column in the tenth row?
19. Subscript n of a general formula a of sequence 3,6,9,12,15 ···?
20. 1x2X3x…… x100=?