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PREP07 Test 1 Pumps A, B, and C operate at their respective constant rates. Pumps A and B, perating simultaneously, can fill a certain tank in 6/5 hours; pumps A and C, operating simultaneously, can fill the tank in 3/2 hours; and pumps B and C, operating simultaneously, can fill the tank in 2 hours. How many hours does it take pumps A, B, and C, operating simultaneously, to fill the tank?
PREP07 Test 2 If $$N=\frac{1}{3}+(\frac{1}{3})^2+(\frac{1}{3})^3$$, then N is between
第一期 If $$t^{3}=3$$, what is the value of $$t^{2}$$?
Magoosh Is $$\frac{x^n}{x^{n+1}}>\frac{x^{n+1}} {x^n}$$?(1) x < 0(2) n < 0
OG18-数学分册 If $$abc\neq 0$$, is $$ \frac{a/b} {c} = \frac{a}{b/c}$$?(1) a = 1(2) c = 1
Ready4

If , then  
PREP07 Test 2 The function f is defined for all positive integers n by the following rule: f(n) is the number of positive integers each of which is less than n and has no positive factor in common with n other than 1. If p is any prime number then f(p) =
300难题 If y = $$2^{x+1}$$, what is the value of y - x ? 1.$$2^{2x+2}$$=64 2.y = $$2^{2x-1}$$
模考带练机经题 Is $$\frac{1}{a}$$ > $$\frac{1}{b}$$?$$ a\neq 0 $$,and $$ b\neq 0 $$ (1)a < b (2)a-b < 0 < a
190215 x,y,z are positive integers that are larger than 1. x+y+z=? 1：x-y-z=1 2：xyz=231
200301 $$\frac { 4 } { \frac { \sqrt { 5 } - 1 } { \sqrt { 5 } + 1 } } = ?$$
191020 $$ \frac { 4 } { \frac { \sqrt { 5 } - 1 } { \sqrt { 5 } + 1 } } = ? $$
Ready4

John can buy apples and mango for , or apple and mangoes for . How much does mango cost?
Magoosh The entire contents of a full sack of flour can be used to make 15 cupcakes and 8 pizzas. The same full sack of flour can be used to make 7 cupcakes and 14 pizzas. If a full sack of flour is used to make only pizzas, how many pizzas can be made?
190321 还原机经选题: 数论&amp;代数 n>2. Is n a prime number?
1:(n-1)!+1 can be divided by n.
2:(n+1)!+2 cannot be divided by n.
Manhattan Lindsay can paint $$\frac{1}{x}$$ of a certain room in one hour. If Lindsay and Joseph, working together at their respective rates, can paint the room in one hour, what fraction of the room can Joseph paint in 20 minutes?
OG17 OG18 OG19 OG20 OG2022 If x is a positive integer, then is x prime?(1) 3x + 1 is prime.(2) 5x + 1 is prime.
If $$x\neq y$$, is x+y=xy?(1) (1-x)(1-y)=1(2) $${x}^{2}-{y}^{2}={x}^{2}{y}-{x}{y}^{2}$$
% of Day 1 shoppers returned to the store on Day 3.Shoppers at Retailer R who purchased substitute items from other manufacturers on Day 1 paid a total amount that was approximately of the total all Day 1 shoppers would have paid had each of them been able to purchase Product X on Day 1.
PREP07 Test 1 Is w greater than 1 ?(1) w + 2 > 0(2)$$ w^2 > 1$$