What is the difference between the sum of (a + 4) + (a + 1) and (a + 4) - (a + 1)

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• 1. What's 25 times 2 / 15?
• 2. It is known that 5x + 10Y is greater than or equal to 480, x y is an integer, and the minimum value of Z = 100x + 150y can be obtained, X y is a positive integer
• 3. How many seconds is an hour, 25 minutes and 35 seconds?
• 4. 0.5x + 5 times 0.7 = 7?
• 5. What's one plus one? I want to ask what's one plus one, what's two plus two
• 6. Under what circumstances is one plus one equal to four?
• 7. Who can tell me why one plus one equals two
• 8. Can one plus one only equal two?
• 9. How many square meters does the - 7 times of 0.7 equal to? Use scientific counting method
• 10. What is 30 / 7 times (7 / 15 minus 3 / 20) minus 5 / 14? For example, there should be complete steps,
• 11. What is a times 3A?
• 12. What is 3A times 3A?
• 13. A horizontal angle is equal to 60 degrees It's a couple of 60 degrees
• 14. What is 2 times (a + 1) times a + 1?
• 15. 32 / (x + 32) times 100% equals 50%
• 16. How much is four fifths to the power of 2010 multiplied by minus five fifths to the power of 2011
• 17. 32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (16 times of 2 + 1) 32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (4 times of 2 + 1) (8 times of 2 + 1) (16 times of 2 + 1)
• 18. 2,3,4,5,6 fill in +, - sign equals 18 how to do
• 19. What is 729 times 80 plus 1 times 250 plus 8755 plus 8755 minus 250 divided by 2
• 20. Because 259 is close to 260, 259 times 89 is about 260 times 80. Is that right or wrong?