How to calculate the equation For example: 5x + 6 = 11

x=（11-6）/5=1

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1. When a student used a calculator to calculate the average of 30 data, he mistakenly input one of the data 108 as 18, so what is the difference between the average and the actual average?
2. An electronic computer can do 108 calculations per second. It can work for 8 minutes according to scientific notation______ This is a calculation
3. An electronic computer can do 10 ^ 8 operations per second. How many operations can it do when it works for 10 ^ 6 seconds? (the results are expressed by scientific notation)
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6. If an electronic computer performs 10 ^ 10 operations per second, how many operations can it perform in 3 * 10 ^ 5 seconds?
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8. An electronic computer can perform 4 * 10 ^ 9 operations per second. How many operations can this computer perform in 10 hours?
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10. In common electronic calculators, the four operation keys are (), (), (), ()
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13. Kobayashi inputs 1,2,3,..., n into the computer and calculates the average. The computer shows that there are only n-1 numbers, with an average of 26.2. What is the missing number?
14. Xiao Ming plans to put 1,2 When he thinks that the input is finished, the computer displays that only (n-1) numbers have been input, flat The average is 30.75, assuming that the (n-1) numbers are correctly input, the number of missing input is
15. According to the steps given in the program block diagram in figure 1.3-3, find the value of F (x) = 0.83x ^ 5 + 0.41x ^ 4 + 0.16x ^ 3 + 0.33x ^ 2 + 0.5x + 1 when = 5
16. 8 × 4-6x = 5. 8, and 13 × (x + 5) = 169
17. 13 (x + 5) = 169 how to solve the equation
18. X-15 2 / 3 = 2 / 3 solution equation
19. X * 6 / 5 = 2 / 15
20. Solving equation: 80 + 10% X-15% x = 79 important process