Add "+" or "-" before the numbers 3, 4, 5, 6, 7, 8 and 9 to make their sum - 10. Please come up with two solutions

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• 1. 109 8 7 6 5 4 3 21 = 1000 in "+, -, *, /, ()", pick out the appropriate symbols and fill in the numbers to make the formula true
• 2. Please fill in an even number in each box "□" in the following formula, so that the formula becomes a force, and 0,2,4,6,8 appear in the product □□□ × □□□ ＿＿＿＿＿＿＿＿ □□□□ □□□□ □□□□ ＿＿＿＿＿＿＿＿＿ □□□□□□
• 3. If there is 0 at the end of the product, the formula that can be listed is. If the product is the largest, the formula that can be listed is 0.4.6.8 if there is 0 at the end of the product, the formula that can be listed is. If the product is the largest, the formula that can be listed is. If the product is the smallest, the formula that can be listed is
• 4. 2. 4, 6, 8... Are continuous even numbers. If the sum of five continuous even numbers is 480, what is the largest one of these five numbers To be able to read and understand
• 5. Use the five numbers 0, 4, 5, 6 and 7 to form the multiplication formula of three digit by two digit. Please write down the test of the largest product and the test of the smallest product  
• 6. Use 3, 6, 2, 4, 5, these five numbers to form three digits multiplied by two digits, in which the largest formula is（
• 7. VB, through the formula to calculate a numerical value, how to get three decimal places, and
• 8. What formula does excel use to get the last digit of the decimal point
• 9. After the decimal point of a number is moved two places to the left, the result is 23.76 less than the original number. What is the original number? (required formula) After the decimal point of a number is moved two places to the left, the result is 23.76 less than the original number. What is the original number? (formula process required)
• 10. In Excel, I want to extract the percentile after the decimal point separately. What formula can I extract? For example: 31.1234, the number I need is 2, for example: 31.1254, the number I need is 2,
• 11. 123456 column multiplication formula. The number does not repeat () () * () = () () () 12345678 () * () = () () () () please answer these two questions. Thank you
• 12. What are the similarities and differences between the calculation method of multiplying decimal by integer and that of multiplying integer by integer
• 13. How to multiply two decimal places by integer
• 14. How to calculate the vertical form of [decimal multiplied by integer]?
• 15. What is the key to the vertical calculation of decimal multiplied by integer
• 16. What is the key point of vertical calculation of decimal multiplied by integer?
• 17. One decimal place, after removing the decimal point, increases by 20.7 points compared with the original number. The original number is ()
• 18. After removing a two digit decimal point, it is increased by 34.65. What are the two decimal places?
• 19. Remove the decimal point of a two place decimal, and the two place decimal will be increased by 100 times
• 20. How many times 1.05 is equal to an integer, need a decimal point; thank you