13.7-9.9 =? And 2.7 - (0.32 + 0.68) =? (need simple calculation) Help me to write it to me with the calculation of stripping!

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• 1. Simple calculation of 9.9 * 9.9 + 0.9
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• 3. Simple operation: 15.32 * 4 + 4.68/0.25
• 4. Simple calculation of 5.68 × 4 + 4.32 △ 0.25
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• 9. What are odd numbers 1, 5, 7, 52, 16, 120, 19, 35, 97, 11, 80? Which are odd, even, prime, composite?
• 10. In 1,2,4,5,13,14,15,19,20, the odd number has (), the even number has (), the prime number has () and the composite number has (), which is both the composite number and the composite number Even numbers have ()
• 11. Simple calculation of 9.68 - (2.9-0.32)
• 12. How can 2.9 * 2.9 + 2.9 * 6.1 + 2.9 be easily calculated?
• 13. How to write 9.9 × 6.4
• 14. (1 / 3-1 / 4) △ 1 / 8 + 5 / 6 8-5 / 9-9 / 1 * 4 (1 / 2-1 / 3 + 1 / 6) * 24 4 / 9 △ 4 / 5 - (1 / 5 + 1 / 3)} simple operation
• 15. Simple operation of 3.2 times 9.4 plus 68 times 0.06 All brothers and sisters, please, class will begin tomorrow!
• 16. How much is 9 out of 20 times 199 + 9 out of 20? It's a simple operation! Beauties help
• 17. Calculation: 1-2 / 5 + 3 / 5 =? 8.1 + 1 / 4 =? (1 / 4 + 1 / 3) × 24 =? 24 ／ 3 / 4 =? 0.2-1 / 5 =? 1 ／ 3 / 2 × 2 / 3
• 18. Simple calculation of 105-7 / 0.16 * 0.24
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