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1 1966、1976、1986、1996、2006这五个数的总和是多少? 提示:1986×5。 2 每边长是10厘米的正方形纸片,正中间挖了一个正方形的洞,成为一个宽度是一厘米的方框,把五个这样的方框放在桌面上,成为这样的图案。问桌面上被这些方框盖住的部分面积是多少平方厘米? (答 172平方厘米) 提示:(10~2-8)×5-8。 3 105的约数共有几个?(答:8) 提示105=3×5×7 它的约数是1。 6、 5、7、15、21、35、105。 4 妈妈让小明给客人烧水沏茶,洗开水壶要用
What is the sum of the five numbers in 1966, 1976, 1986, 1996, and 2006? Tip: 1986×5. 2 Each side is a 10-centimeter square piece of paper. A square hole is dug in the middle. It becomes a square with a width of one centimeter. Place five such boxes on the desktop and make this pattern. Q. How many square centimeters are covered by these boxes on the desktop? (answer 172 square centimeters) Tip: (10~2-8)*5-8. What is the total number of divisors of 3 105? (Answer: 8) Tip 105 = 3 x 5 x 7 Its divisor is 1. 6, 5, 7, 15, 21, 35, 105. 4 Mom told Xiaoming to boil water for guests and use tea to wash kettles