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190302
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One shop sells two kinds of bowls. Each class a bowl costs $15. The price of each class B bowl is $18. Initially, there were 20 class A bowls and 18 class B bowls in this shop. A week later, the store's sales were $222. How many bowls are left in class A?
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190302
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$$a_1$$=2,$$a_2$$=$$a_1^{3}$$,$$a_3$$=$$a_2^{3}$$,...,$$a_n$$=$$a_{n-1}^{3}$$.$$a_99$$=?
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190302
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16 < $$\frac{(n-1)!n!(n+1)!}{n!}$$ < 17. n is an positive integer. n=?
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190302
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As shown in the figure, the four points divided XY into three equal parts. What is the value of y in terms of x?
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190302
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The remainder is 15 when 75 is divided by x, and the remainder is 8 when 48 is divided by x. What is the range of x?
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190302
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The distance from an asteroid to earth is 3.8*$$10^{5}$$m. The distance between the moon and the earth is 4*$$10^{2}$$m. The distance from the asteroid on a map to the earth is 1.9cm. What is the distance from the moon to the earth on the map?
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190302
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$$x^{2}$$-(m-2)x-$$(n+4)^{2}$$=0 has only one solution. mn=?
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190302
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In the coordinate system, the slope of OA is $$\frac{7}{24}$$. BA=14. OA=?
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190302
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The sum of x, y, and z is even. Can xyz be divided by 4?
1: x=y=z
2: x,y,z are even.
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190302
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The length, width and height of cuboid are w, m and h respectively. The cuboid is filled with a little water. When w*m is the bottom, the height of water is x (x < h). When m*h is the bottom, the height of water is y (y < w). $$\frac{x}{y}$$=?
1：x=3
2：$$\frac{w}{h}$$=7
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190302 还原机经选题: 数论&代数
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n=1234567891011121314…. n is an integer composed of positive integers arranged in order. From left to right, what is the 72nd digit of n?
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190302
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p < q < r < s < t. The average of these five numbers is 6 less than t and 5 more than p. What is the range of {p,q,r,s,t}?
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190302
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Which of the following is closest to 9*$$10^{10}$$ - 2*$$2^{5}$$?
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190302
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$$2^{x}$$=$$4^{a}$$.What is the relationship between a and x?
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190302
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nm≠0, Is $$n^{2}$$ - n=$$m^{2}$$ - m?
1:n+m=1
2:n=m
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190302
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AC=OB. What is the relationship between x and y？
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190302
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Is $$x^{2}$$+9x+y even?
1：x=10
2：y=15
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190302
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$$\frac{1}{n(n+1)}$$-$$\frac{1}{(n+1)(n+2)}$$=$$\frac{2}{n(n+1)(n+2)}$$.$$\frac{2*29}{5*6*7}$$+$$\frac{2*29}{6*7*8}$$+$$\frac{2*29}{7*8*9}$$+......+$$\frac{2*29}{28*29*30}$$=?
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190302
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A quadrilateral ABCD is inscribed in the circle O whose center is on segment AC. ∠BAD=70°. ∠BCD=？
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190302
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How many solutions does the quadratic equation 2$$x^{2}$$+3x+c=0 have?
1：△ > 0
2：c > 0
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