1.明顯是210,因?yàn)?1和30只有公因數(shù)3,因?yàn)槊織l邊整數(shù)所以一條邊是3,所以長(zhǎng)寬高為10,3,7,v=210
2.明顯只有一組3,5,7,因?yàn)閚,n+2,n+4中一定會(huì)有一個(gè)是3的倍數(shù),而只有3是質(zhì)數(shù),所以只有1組.
一個(gè)長(zhǎng)方體的地面積是21,另外,其中一個(gè)面的面積是30.
一個(gè)長(zhǎng)方體的地面積是21,另外,其中一個(gè)面的面積是30.
請(qǐng)問體積是多少?答案是220.
1,The area of the base of the rectangular box is 21 and the area of one of the faces is 30.Each of the dimensions j,k,and l is an integer greater than 1.What is the volume of the rectangular box?（答案是220）
If n>1 and each of the three integers n,n+2,n+4 is a prime number,then the set of three such numbers is claaed a"prime triple"There are how many different prime triples?（答案是1）
請(qǐng)問體積是多少?答案是220.
1,The area of the base of the rectangular box is 21 and the area of one of the faces is 30.Each of the dimensions j,k,and l is an integer greater than 1.What is the volume of the rectangular box?（答案是220）
If n>1 and each of the three integers n,n+2,n+4 is a prime number,then the set of three such numbers is claaed a"prime triple"There are how many different prime triples?（答案是1）
數(shù)學(xué)人氣：330 ℃時(shí)間：2020-05-11 20:37:22
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