SAT数学题A simple square is any integer greater than 1 that has
SAT数学题
A simple square is any integer greater than 1 that has only three positive integer factors-----itself,its square root,and 1.Which of the following is a simple square?
A 121 B 100 C 81 D 64 E 33
A simple square is any integer greater than 1 that has only three positive integer factors-----itself,its square root,and 1.Which of the following is a simple square?
A 121 B 100 C 81 D 64 E 33
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求一个数这个数只能被它自己和它自己的平方根和1整除
A：121 is the product of only 11 and 11 ,or 1 and 121.Since 11 is the square root of 121,then 121 has only three positive integer factors,itself 121 ,its square root 11 ,and 1
B:100 is the product of 100 and 1,20 and 5,2 and 50,4 and 25,etc.then 100 has more than 3 positive integer factor
c:81=9*9,81*1,3*27,where 3*27 is not itself nor its square root nor 1
d:64=8*8,2*32,where 2*32 is not itself not its square nor 1
e:33=1*33,3*11,and so it has only 2 positive integer factors.
then answer is A.
A：121 is the product of only 11 and 11 ,or 1 and 121.Since 11 is the square root of 121,then 121 has only three positive integer factors,itself 121 ,its square root 11 ,and 1
B:100 is the product of 100 and 1,20 and 5,2 and 50,4 and 25,etc.then 100 has more than 3 positive integer factor
c:81=9*9,81*1,3*27,where 3*27 is not itself nor its square root nor 1
d:64=8*8,2*32,where 2*32 is not itself not its square nor 1
e:33=1*33,3*11,and so it has only 2 positive integer factors.
then answer is A.
1年前
8
共回答了3个问题 举报
找一个数（simple square).此数特征：只有三个正因数：1，自己，还有自己的平方根
121:1, 11, 121
100： 1,2 ，5 ，10 ...........
81:1.，3， 9 ............
64:1， 2， 4..........
33:1,3,11..........
符合条件的只有A
121:1, 11, 121
100： 1,2 ，5 ，10 ...........
81:1.，3， 9 ............
64:1， 2， 4..........
33:1,3,11..........
符合条件的只有A
1年前
1
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