There are two prime numbers? What are they? 23、7? Note: 1 and 0 are not prime numbers or composite numbers)? What is a composite number? 2 (18, 9 1? Among them? 9 1=7* 13)
Note: Prime numbers, composite numbers, odd numbers and even numbers are all natural numbers (natural number collection of symbols: n).
2. Each section is 5/6m long and 5m 1/6.
3.2115+7115, which means 2/15+7/15 = 9/15 = 3/5.
4. What is the maximum quantity? 6/7(6/7≈0.857 1)? The smallest number is 2/3(≈0.6667)? 4/5 is equal to 0.8.
5. Surface area = 8 * 4.4 * 2+8 * 5 * 2+5 * 4.4 * 2 =194.4 m2 (194.4=972/5).
Volume =8*5*4.4= 176 cubic meters