The solution of 3x + 22 = 5x

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• 1. 3/5x+2/5x=7/8
• 2. 2.5 (x + 2) - 4.5 (X-6) = 5x-7, how to solve x
• 3. X + 1.5x = 13 (what is the solution?)
• 4. Calculation process of 1200 / x-1200 / 1.5x = 10 More details, thank you!
• 5. What is the solution of 1200 / X-10 = 1200 / 1.5x
• 6. (x^2+5x+4)(x^2+5x)+6(x^2+5x)+24
• 7. Square of X + 10x + 21 = 0
• 8. How to calculate the square of x plus 10x + 21 = 0
• 9. Substitute the whole into the square of known x-5x = 6 to find the value of square of 10x-2x + 5
• 10. Decomposition factor: (x-a) ^ 2 - (X-B) ^ 2 =?; X + 2x ^ 2 + x ^ 3 =?; 5x ^ 3-10x ^ 2 + 5x =?
• 11. (x-3 / 5x) + 20 = x / 2 solve the equation I'm begging you. Please do it,
• 12. How to solve the equation 5x + 3 times 15 = 215
• 13. Store a and store B sell the same goods at the same price, and each of them offers different preferential schemes: after purchasing 100 yuan goods in store a, 90% of the original price will be charged for the goods they buy again; after purchasing 50 yuan goods in store B, 95% of the original price will be charged for the goods they buy again. How can customers choose a store to get more preferential treatment? 1) When the cumulative purchase is more than 100 yuan but less than 150 yuan, which store will spend less? 2) When the cumulative shopping is just 150 yuan, which store will cost less?
• 14. A and B stores buy a commodity at the same unit price of 200 yuan. Store a sells it at a 30% profit increase, and store B sells it at a 20% profit increase. As a result, the number of items sold by store B is twice that of store a, and the total profit is 8000 yuan more than that of store A. how many items do store a and store B sell?
• 15. When a shopping mall sells a commodity, its profit margin increases by 8 percentage points because the purchase price is 6.4% lower than the original purchase price?
• 16. Let the price function be p = 15E ^ - X / 3 (x is the output) I need help
• 17. Given the demand function q = 6750-50p, the total cost function TC = 12000 + 0.025q2 (Q2 is the quadratic power of Q), the maximum profit, output, price and maximum profit can be obtained
• 18. If the cost of a commodity is reduced by 8% and the retail price remains unchanged, the profit margin will increase from the current M% to (M + 10)% Here's my calculation: Let the cost be X m%x=(m+10)%-92%x The result is m = 115 The other answers are m = 15. I want to know what's wrong with my problem-solving process. (my idea is basically: retail price remains unchanged. Cost * profit margin = retail price). I wonder where to reduce 100%?
• 19. The profit of a commodity at its current price is 26% of the cost. If the cost is reduced by 10%, what percentage of the cost is the profit at the current price
• 20. Given that z is a complex number and the module of (z-2i) = 1, then the value range of the imaginary part of Z is