Simple calculation of 1 / 5 + 2 / 9 × 3 / 10 + 4 / 5

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• 1. Simple calculation of 13 and 2 / 13 minus 2.27 minus 7 and 3 / 4
• 2. Simplification (1) √ 20 + √ 5 divided by √ 5 - 2 (2) √ 12 + √ 27 divided by √ 3 (3) (√ 3 + √ 2) * (√ 3 - √ 2) (4) 2 √ 12 + 3 √ 48 (5) √ one seventh + √ 25 - √ 700 (6) √ 32-3 √ one half + √ 2
• 3. The result of simplifying the square of a / A-3 + 9 / 9 divided by a / A + 3 is ---
• 4. Calculation: √ 27 - √ 8 - √ 12 + √ (1 / 32)
• 5. How much is √ 8 - (3 √ 32-2 √ 18)
• 6. Calculation of mathematical power (- 3) &# 179; + 3 &# 178; (1-4),
• 7. Look at the following three lines: - 2, 4, - 8, 16, - 32, 64 & nbsp ①0，6，-6，18，-30，66… ②-1，2，-4，8，-16，32… ③ (1) what is the order of the number of the first row? (2) What is the relationship between the number of rows 2 and 3 and the number of rows 1? (3) Take the tenth number of each row and calculate the sum of the three numbers
• 8. Given that a and B are rational numbers, if the value of the formula (AX & # 178; + 2bx-y + 1) - (3x & # 178; - 4x + 10y-2 / 3) has nothing to do with the value of X, try to find the value of a and B What's more: a water conservancy construction site sends 48 people to excavate and transport soil. If each person excavates 5 cubic meters of soil or transports 3 cubic meters of soil every day, how to arrange the personnel to transport the excavated soil in time? In the road construction project of the western development, there is an important project that needs the cooperation of two engineering teams. It is known that it takes 20 days for team a to do it alone, and 12 days for team B to do it alone? It takes 32 days to complete a job by one person. Now it is planned that some people will do it for 2 days, and then one more person will work with them for 4 days to complete half of the job. Assuming that these people have the same work efficiency, how many people should be assigned to work first? Electric locomotive and maglev train start from two places 894km apart at the same time. The speed of maglev train is 20km / h faster than that of electric locomotive. After 1.5h, the two cars meet. What are the speeds of the two cars? In a math self-study class, Xiao Ming said to his deskmate: "I find a number, add 2 first and then divide by 3, which is the same as adding 3 first and then divide by 2. Do you know which number I am looking for?" can you find out this number? Try it!
• 9. Choose the appropriate method, then the square of the following equation (2x-1) + 3 (2x-1) = 0
• 10. Solve the equation x & # 178; - 12x 63 = O,
• 11. What is the simplification ratio of 7 out of 12 to 5 out of 18
• 12. 7/6+13/12+21/20+31/30+… +421/420
• 13. 7 / 6 + 13 / 12 + 21 / 20 + 31 / 30 + 421 / 420
• 14. Simple calculation of 3 / 7 + [18 / 5 - (14 / 5 × 4 / 7]
• 15. 11 out of 7 have () 1 out of 7, 16 have () 1 out of 7, 16 have () 1 out of 5 are () and ()
• 16. Is the following formula correct? Talk about the reason 42 + 65 + 58 + 35 = (42 + 58) + (65 + 35) 4 * 8 + 25 * 5 = 4 * 25 + 8 * 5
• 17. Simplification (√ X-2) & # 178; - √ (2-x) & # 178;
• 18. Simplification (√ m) & # 178; - (√ - n) & # 178=
• 19. Can (n + 1) &# 178; - N & # 178; be simplified? If you can, please write down the steps. Please
• 20. Simple calculation of 27 * 45 + 27 * 54 + 27