What is 30.75 of 3 and 4?

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• 1. When Xiao Ming solved the equation 2x-15 + 1 = x + a 2, due to carelessness, the left 1 of the equation was not multiplied by 10 when the denominator was removed, so the solution obtained was x = 4 When Xiao Ming solved the equation 2x-15 + 1 = x + A2, due to carelessness, when the denominator is removed, the left 1 of the equation is not multiplied by 10, so the solution obtained is x = 4. Try to find the value of a and correctly find the solution of the equation
• 2. Because the efficiency of a is 25% higher than that of B, a finishes 10 minutes later than B and 20 minutes earlier than B How many minutes does it take for Party B to complete the task of machining parts?
• 3. Solution equation: (230-x) × 3 / 8 = 5 / 7X
• 4. Each of the two warehouses has several tons of grain. After 25% of the grain is transported from warehouse A to warehouse B, it is transported from warehouse A to warehouse B 25% from warehouse B to warehouse A. at this time, the storage beams of warehouse A and warehouse B are equal. What percentage of warehouse A is warehouse B?
• 5. Find 1 / 100 + 1 / 101 + 1 / 102 + +Integral part of 1 / 300 Can this question be written like this? (1/100+1/300)*201÷2=67/50=1.34 The result is 1
• 6. What is the integral part of 10 / 100 + 10 / 101 + 10 / 102 + 10 / 110? We need to explain the formula. We can't use X. by the way, 1
• 7. 100+101+102+103+104.300=?
• 8. Calculation: | 101 / 1-102 / 1 | + | 102 / 1-103 / 1 | + | 103 / 1-104 / 1 | + +|109/1-110/1|
• 9. It is known that a = 110100 + 210101 + 310102 + +1110110, then the integral part of a is______ ．
• 10. It is known that a = 110 / 100 + 212 / 101 + 316 / 102 + 1220/110 Finding the integral part of a
• 11. If a and B are non-zero real numbers with unequal absolute values, then the value of a / B + B / a () a is greater than 2, B is less than - 2 or greater than 2 C less than or equal to 2 D greater than - 2 or less than 2
• 12. The average number of a, B and C is 70, a: B = 2:3, B: C = 4:5, B number______ ．
• 13. Digital puzzle 123, 321, 1234567
• 14. A, B and C go shopping together, 1 / 2 of a's money is equal to 1 / 3 of B's money; 3 / 4 of B's money is equal to 4 / 7 of C's money; C is more than a How much did the three spend for 93 yuan? Ask for the column, do not copy
• 15. How to factorize the square of 28 + 56 * 42 + 4
• 16. The number of boys is 12 more than two fifths of the class, and the number of girls is half of the number of boys. Q: how many students are there? The number of boys is 12 more than two fifths of the class, and the number of girls is half of the number of boys. How many are there in total?
• 17. If x = 2, the value of the algebraic formula AX3 + BX + 1 is 6, then when x = - 2, the value of the algebraic formula AX3 + BX + 1 is 6______ ．
• 18. There are 200 sixth grade students, half of whom are boys, equal to one third of whom are girls. How many boys and girls are there in the sixth grade Why 2 + 3
• 19. Mathematical problems of derivative function, How to understand that the tangent equation of a given curve y = f (x) at x = 1 is y = X-1, Analysis shows that, f (1) = 0, f '(1) = 1,? This place does not understand, what is the relationship between the derivative function of the curve and the tangent, why f' (1) = 1, find the reasoning process
• 20. There are 60 male workers in a workshop, one third more than female workers. How many female workers are there