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190310 The general term of the sequence of equal difference numbers is $$a_{n+1} = a_{n} +7$$.$$ \sum^{20}_{i=1} a_{i} = 1530$$.$$s_4$$=?
190310 How is $$(x-1)^2 \geq 0$$ represented on the number axis?
190310 p,s,t are prime numbers. $$p^3s^3t^3$$=?
1:$$p^4st=1456$$
2:t=13
190310 Is |x|+|y|>|x+y|?
1:xy<0
2:x>y
190310
∠DAB=60°,∠ABC=75°,∠BCD=90°. BC=CD=x. What is the circumference of quadrilateral ABCD?
190310 The averages of $$x_1,x_2,...,x_10$$;$$x_1,x_2,...,x_6$$;$$x_6,x_7,...,x_10$$ are a,b,c, respectively. $$x_6$$=?
190310
CD is orthogonal to AD. CD=1. AB=?
1：AC =2
2：AB=BC
190310 The radius of a balloon was x. After air letting out, the volume was reduced by 48.8%. If the balloon is always sphere. What`s the functional relationship between the radius r after leaking and the original radius x?
190310 160 cards are given to m children (m≥2). Each person can receive the same number of cards. What`s the possible value of m?
190310 Is x > 5? 1:$$x^2 > 25$$ 2:2x+7 > 0
190310 A, B is independent of each other. The probability of occurrence of event A is 1/3, and that of event B is 1/2. What is the probability that only A or B will happen?
190310 x/y=?
1:2x-y=20
2:$$x^2 = y^2$$
190310 Is the quadrilateral ABCD rectangular? AB=5, BC=12.
1: The length of the diagonal AC is 13.
2: AB=CD, AD=BC
190310 $$(\sqrt{5} - \sqrt{3})^2$$ = ?
190310 There are 21 students in a class. Does the average score of the class exceed 80?
1: The median score of the students in the class is 91.
2: The lowest score of the students in the class is 78.
190310 A positive integer x is a multiple of 5. What is the remainder of x when divided by 6?
1: The remainder of x is 3 when divided by 12.
2: The remainder of x is 3 when divided by 4.
190310 What is the largest prime factor of 2205?
190310 还原机经选题: 文字题&amp;几何 The price of clothes in stores has gone up. Thus, the profit has increased from 15% of the cost to 40%. The cost of clothes does not change. The current price of each cloth is $70. What is the original price?
190310 e >d. Is ed < 0?
1:ed^2 >e^2d 2:e+d=1
190310 r,s are positive numbers. Is r < s?
1:r+s<1 2:$$r^2=2s$$