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来源	题目内容
190310 还原机经选题: 数论&代数	The number of people in the tour group is counted as x. The ticket rules of the amusement park are: when x≤10, the total ticket price is $120; when 11≤x≤20, the total ticket price is 80 + 4x dollars; when x > 20, the total ticket price is 8x dollars. How many people are there in group B? 1: Group A has three fewer people than group B. 2: Group B pays $4 more than group A.
190415 还原机经选题	m,n,k are integers.$$\frac{9}{10}$$ < $$\frac{1}{n}$$+$$\frac{1}{m}$$+$$\frac{1}{k}$$ < 1. Is m+n+k > 11? 1:n=2, m=3 2:k=7
200301 还原机经选题	If x and y are all real numbers,is x > 1? 1.x$$\sqrt{y}$$ >1 2.$$\sqrt{x}$$y < 1
190113 还原机经选题	List multiples of 3 except 0 in a sequence: 369121518... 300. What is the 72nd digit in this sequence?
190603 还原机经选题: 数论&代数	As shown in the figure, A splices squares with matches, and 3 matches will be used for each additional square, which will be marked as an S; B uses matches to splice geometric figures on the basis of trapezoids, and 2 matches will be used for each additional geometric figure, which will be marked as a T. A spliced n additional squares, b spliced m additional geometric figures. What is the value of m? (1)n = m (2)Two people have used the same number of matches
191031 还原机经选题: 数论&代数	If$$ a_1=1$$,$$a_n=-1/[(a_{n-1})+1]$$,then what`s the value of $$a_{2012}$$?
200301 还原机经选题: 数论&代数	If s = 1/(1+2+3+4)+1/(1+2+3+4+5)+...+1/(1+2+3+...+98+99), what`s the range of s?
191222 还原机经选题	Is x an integer? 1: 5x is an integer 2: The reciprocal of x is an integer
191222 还原机经选题	Known that -1 and 3 are the two roots of f (x) = ax ^ 2-bx + c, Is f(1)>0? (1)f(0)=2 (2)f(-3)>f(-4)
还原机经选题 191222	The "ultimate number" can be calculated in this way: add up the values of each digit until there is only one digit left. For example, 9901, 9+9+0+1= 19, 1+9= 10, 1+0=1, 1 is the "ultimate number" of 9901. How many two-digit numbers are there that have the same ultimate number as 50645?

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