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190415 # is one of the ways of adding, subtracting, multiplying and dividing. What kind of operation does # represent? 1: a*(a#a)=0 is true for any a. 2: a#(b#c)=(a#b)#c
190415 What`s the hundreds digit of 12.3789*9999?
190415 What`s the largest prime factor of 11!+12!+13!?
190415 Is |2X-Y|=|2Y-X|? 1:X=Y 2:Y > 0
190415 MY*CD=12. BX*AC=? 1:BX=3MY 2:AC=5CD
190415 还原机经选题: 数论&代数 12! can be divided by $$(4!)^{n}$$ but cannot be divided by $$(4!)^{n+1}$$ .n=?
190415 S=S={1,2,3,4,5,11,x}. x is a positive integer. Is ? 1: The median of S is 4. 2: x is larger than or equal to the median.
190415 Which option represents the largest number?
190415 S is the total volume of 16 balls whose diameters are 1. C is the volume of 16 cylinders with a diameter of 1 and a height of 1.$$\frac{s}{c}$$=?
190415 x is a positive integer. Is the remainder of x over 12 less than 8? 1: The remainder of x over 48 is 8. 2: The remainder of x over 50 is 9.
190415 Both X and Y are zinc-copper mixtures. The ratios of zinc to copper in X and Y are 5:7 and 8:7, respectively. If X and Y are mixed in a 1:1 ratio, what is the ratio of zinc to copper in the mixture?
190415 $$\frac{1}{n}$$ < $$\frac{1}{31}$$ < $$\frac{1}{32}$$ < $$\frac{1}{33}$$ < $$\frac{1}{n-1}$$.n=?
190415 f(x)=1-x+$$x^{2}$$-$$x^{3}$$+$$x^{4}$$-$$x^{5}$$.f(3)=?
190415 In parallelogram ABCD, AE=a, EB=b, BN=a, NC=b, CH=a, DH=b, MD=b, AM=a. What is the area of the quadrilateral EMHN? 1: The perimeter of the quadrilateral ABCD is 48. 2: The area of quadrilateral ABCD is 144.
190415 A square and a rectangle has the same circumference. The area of the square is 400 more than that of the rectangle. The length of the rectangle is three times the width. What is the area of the rectangle?
190415 A and B are regular hexagons. The length of each side of B is 2% longer than that of A. The volume of A is 8. What is the volume of B?
190415 $$a_1$$=4,$$a_n$$=2$$a_{n+1}$$,$$a_8$$=?
190415 In the sequence {$$a_n$$}, $$a_1$$=3,$$a_2$$=5,$$a_n$$=$$a_{n-1}$$+$$a_{n-2}$$(n≥3).$$\frac{a_24}{a_20}$$=?
190415 Quadrilateral ABCD is a square. The triangle BCE is an equilateral triangle. BC=10. DE=？
190415 The price of the class A computer is reduced by 20% to $2000. After a 25% increase in the price of the class B computer, the price will be $2000. What is the sum of the original prices of class A and class B computers?