How to simplify the formula 8A - (5a + 8)

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• 1. For the simple calculation of 102 * 76, there must be a formula
• 2. A simple formula is required Topic 1 / 2008 + 2 / 2008 + 3 / 2008 + +2007/2008 Pay attention to the reasons
• 3. A few junior one's formula, require simple calculation The first course: 1-3 + 5-7 + 9-11 +. + 97 + 99 The second course: 1 + 2-3-4 + 5-6-7-8 + 9. + 2002-2003 + 2004 + 2005 Requirements: simple calculation, steps should be listed,
• 4. A few junior one's, on the absolute value of the formula, requires simple calculation I can't get the score, for example, half is expressed as 1 / 2 Question 1: 1 / 1001-1 / 100 + 1 / 1002-1 / 1001 - 1 / 1002-1 / 1000 Question 2: 1 / 2-1 / 3 + 1 / 3-1 / 4 + 1 / 4-1 / 5 + 1 / 49-1 / 50 Ask for a brief calculation and list the steps
• 5. Calculate the following formula. If you can do it simply, do it simply 10.5÷2.5×0.4 What is the order of calculation? Can we calculate 2.5 × 0.4 first and then calculate it? Why?
• 6. 2/5x25x5/6x4
• 7. 0.325 * 0.8 + 0.55 / 5 / 4-3 / 5 / 8 / 7 =? (simple calculation)
• 8. 1994 + 1 / 2-1 + 1 / 3 + 2 + 1 / 2-3 + 1 / 3 + 4 + 1 / 2 -. + 1992 + 1 / 2-1993 + 1 / 3?
• 9. 1994 + 1 / 2 - (1 + 1 / 3) + (2 + 1 / 2) - (3 + 1 / 3) + (4 + 1 / 2) - (5 + 1 / 3) +. + (1992 + 1 / 2) - (1993 + 1 / 3) I can't understand the formula by writing
• 10. Simple calculation of 3 / 4 × 4.46 + 55.6 × 7.5%
• 11. 4.8 * 2.5 simple calculation formula,
• 12. 1+1= 1+8+8= 1+2+3+4+5+6+7+8+9+10…… +100 = (formula)
• 13. 9 / 2 ＋ 2 / 1 ＋ 5 / 4 ＋ 8 / 3 if you can, please give me the complete formula
• 14. The value of the formula 3 * 1! - 4 * 2! + 5 * 3! - 6 * 4! + 7 * 5! - 8 * 6! + 9 * 7! Is () in steps
• 15. 1 ×} + 2 ×} + 3 ×} + 4 ×} + 5 ×} + 6 ×} + 7 ×} + 8 ×} + 9 ×} + 10 ×} =? There should be a formula Wrong, it's 1 ×} + 2 ×} + 3 ×} + 4 ×} + 5 ×} + 6 ×} + 7 ×} + 8 ×} + 9 ×} + 10 ×} = 1980
• 16. 56 = () times () times () times ()
• 17. 56 times 7, first calculate {} times {} = {}, then calculate {} times {} = {}, and finally calculate {} + {} = {}, so 56 times 7 = {}
• 18. In 56,95130789, the multiple of 2 is What about even and odd numbers? What about multiples of 5?
• 19. 27 56 50 72 97 91 83 105 891 121 prime number () composite number () odd number () even number () multiple of 2 () multiple of 3 () multiple of 5 The number of urgent first satisfactory answer
• 20. Among the four numbers of 21, 35, 56 and 60, (). ①: 2 has one multiple, ②: 3 has two multiple and ③: 5 has three multiple Among the four numbers 21, 35, 56 and 60, (). ① There is one multiple of: 2 ② There are two multiples of: 3 ③ There are three multiples of: 5