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Ready4
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For how many ordered pairs  "(x,y)") that are solutions of the system above are  and  both integers?
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Ready4
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If n is a positive integer and  which of the following could NOT be a value of k?
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OG19-数学分册
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The figure shown above consists of three identical circles that are tangent to each other. If the area of the shaded region is $$64\sqrt{3} - 32\pi$$, what is the radius of each circle?
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Ready4
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The ratio 3 to is equal to the ratio
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190124
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$$\frac{4+\sqrt{28}}{\sqrt{9}+7}$$=?
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190310
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$$\frac{4- \sqrt{28}}{\sqrt{9+7}}$$ = ?
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$${99},{999}^{2}-{1}^{2}=$$
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PREP07 Test 2
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If $$N=\frac{1}{3}+(\frac{1}{3})^2+(\frac{1}{3})^3$$, then N is between
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PREP07 Test 1
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for any integer k from 1 to 10, inclusion, the kth of a certain sequence is given by $$(-1)^{k+1}(\frac1 {2^k})$$. If T is the sum of the first 10 terms of the sequence, then T is:
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A container in the shape of a right circular cylinder is $$\frac{1}{2}$$ full of water. If the volume of water in the container is 36 cubic inches and the height of the container is 9 inches, what is the diameter of the base of the cylinder, in inches?
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OG12 OG15 OG16 OG17 OG18
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If n is an integer greater than 6, which of the following must be divisible by 3?
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190215
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The radius of all three circles is r. The top circle is tangent to the bottom two circles. The closest distance between two points on the circumferences of the bottom two circles is a. These three circles are tangent to the quadrilateral ABCD. How is BC represented by r and a?
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200301
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The cone has 4 sides (similar to 4-sided dice). The numbers on it are 1, 2, 3, 4 and now toss it twice. What is the probability that the sum of the two numbers is a multiple of 3?
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If $${u}{v}!={0}$$,what is the value of $$\frac{({u}^{4})({v}^{3})-({u}{v})^{3}}{({u}^{4})({v}^{4})}$$ ?1. u = 32. v = 27
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OG20 OG2022
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If xyz ≠ 0, what is the value of $$\frac{x^{4}z^{2}}{z^{2}y^{2}}$$
1.$$y^{2}=x^{4}$$
2.$$x = 2$$ and $$y = 4$$
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PREP07 Test 2
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A certain motel has a total of 540 units, each of which has a 1-person, 2-person, or 4-person capacity. How many people stayed in the motel's 4-person units yesterday?(1) At this motel, 1/3 of the units are 4-person units.(2) Yesterday, 80 percent of the 4-person units in the motel were filled to capacity, and the rest of the 4-person units were empty.
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191020
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X^4-X^3+X^2-X>0?
(1)X^4>X^2
(2)X<0
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190113 还原机经选题
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(($$\frac{1}{3})^{2}+\frac{1}{3}*\frac{1}{4}$$)*(($$\frac{1}{3})^{2}-\frac{1}{3}*\frac{1}{4}$$)=?
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190215
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Is 4 a factor of 4?
1: x-y is even.
2: x+y is even.
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190302
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($$\frac{1}{3^{2}-$$\frac{1}{3}$$*$$\frac{1}{4}}$$($$\frac{1}{3^{2} }$$+$$\frac{1}{3}$$*$$\frac{1}{4}$$}$$=
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