Factorization of mathematics in Grade Seven

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1. If a, B and C are the three sides of a triangle, and a & # 178; + B & # 178; + C & # 178; = AB + BC + Ca, try to judge the shape of the triangle and explain the reason
2. Intelligence arithmetic 1\5\5\5 Addition, subtraction, multiplication and division are equal to 24 or - 24
3. Today there are 100 steps for the good and 60 steps for the bad Follow it. What's the geometric step? I know it's 250 steps, but I don't know how to calculate it Using equation
4. A simple mathematical problem I haven't been to school for a long time, so I have no idea My friend asked me a seemingly simple math problem, but I couldn't answer it. It was painful. I felt very simple, but I just couldn't figure it out. I was crying The questions are as follows: My friend and a girl sell things. My friend gives 32, and the girl gives 50. Besides the capital, the profit is 108. How to divide the money? Please answer the formula or method. I mainly want to know the method
5. A very simple mathematical problem A businessman spent 8 yuan to buy a commodity. After a period of time, he sold it with 9 yuan. After a period of time, he bought it back with 10 yuan. Finally, he thought the commodity was bad, so he sold it with 11 yuan. Excuse me: did the businessman make or lose in this business? If he made, how much did he make? If he lost, how much did he lose?
6. A mathematical problem It takes 20 days for a project to be completed by Party A and Party B, 8 days for Party A and 36 days for Party A to complete the rest. If the rest is done by Party B, how many days will it take Please give a detailed algorithm!
7. Ask some math questions (- 5) - (- 2.5) + (- 1 / 2) (- 5 and 1 / 2) - (4 and 4 / 5) + (- 3 and 1 / 5) + + 2 and 1 / 2) (1.7) - absolute value of negative 4.3 + absolute value of negative 1.7 + (- 6.8) 1-0=( ) 0-1=( ） 0-（-2） a-( )=0 -b-( )=0 The number - 3 less than - 6 is
8. (-5p)*2pg=? 2x*5*x=? 1/4m*4n*(-p)=? 6 * 3x divided by 2x * 5 =? 7+m+6+3m=? 8x^+2x+7x^+3x=? Finally, why m + N-M + n = 2n?
9. Mathematical problems (super simple) 4 1 4 1 - + - =? -* - =? 7 3 7 3 How much is 4 / 7 times 1 / 3?? 4 out of 7 plus 1 out of 3 = how much??
10. Math problem arithmetic problem is very simple 200 - 500 = how much is it to solve a good mathematical answer
11. The product of (x + 1) (X & # 178; + - 5AX + a) does not contain X & # 178; if the term a = () M & # 178; + M-1 = 0, then M & # 179; + 2m & # 178; + 2013 = () (- 2) to the power of 2012 + (- 2) to the power of 2013 = then the questions and answers of the types frequently tested in the examination and the various types frequently explained in detail must be at least 6
12. It is known that x belongs to. 0 to 2. What is the range of SiNx + cosx of function y = root 3 times The answer should be - 1 to root 3. I feel that the following two are not right. Who can tell me
13. If 1 Δ k = 3, then the range of function f (x) = k Δ x is
14. The specified sign "*" represents an operation, that is, a * b = AB + A + B, a, B are positive real numbers, and 1 * k = 7 is known, then the range of function f (x) = k * x is______
15. (1) Given 0 ＜ x ＜ π / 2, cosx = 4 / 5, then TaNx = (2) function y = cos (3 π / 2 - x) / cos (3 π - x) minimum positive period is
16. The minimum positive period sum of the function y = cos (3 π / 2-x) cosx is
17. Y = the minimum positive period of the radical (COS ^ 4 (x / 2) - cosx)
18. The minimum positive period of the function y = radical (COS ^ 4 x / 2 - cosx) is__________
19. The minimum positive period of the function y = cosx · cos (x - π / 3) is? Process urgent!
20. The period of y = cos absolute value x and y = cos absolute value x