the product of 7 and a number is more than the sum of 7 and the number ,what is the number what is the smallest integer than could be a solution for a number?
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the product of 7 and a number is more than the sum of 7 and the number ,what is the number what is the smallest integer than could be a solution for a number?
题意如下:7和另一个数之积比7和这个数的和大.这个数是多少?最小整数解是多少?
解法如下:suppose this number is x
then 7x>7+x
6x>7
x>7/6
the smallest integer for this question is 2
If a three-digit number is selected at random from the integers 100 to 999, inclusive, what is the probability that the first digit and the last digit of the integer will both be exactly two less than the middle digit?
A.1:900
B.7:900
C.9:1,000
D.1:100
E.7:100
Suppose the number is X, then,
7*X > 7+x
so X>7/6
The smallest integer is 2.
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