If x and y are positive integers such that x=8y+12,what is the greatest common divisor of x and 1) x=12u,where u is an integer2) y=12z,where z is 由题知:x=4(2y+3)由(1)知:x=12u 则y=3k k is an integer.x=12(2k+1) 则x,y最大公因子不能确定.

GMAT If x and y are positive integers,and x^3*y^4=2000.What is the value of xy?这个...有木有技巧... if x and y are the tens digit and the units digit, 求翻译!if x and y are the tens digit and the units digit, respectively, of the product 725,278X(这个是乘号）67,066,what is the value of x+y? If x,y,and k are positive numbers such that [X/(X+Y)]*10+[Y/(X+Y)]*20=k,and if x < y,which of the following could be the value of A.10B.12C.15D.18E.30 代数应用题!The profits made by selling a hamburger and a can of soft drink are $x and $y respectively.If 28 hamburgers and 20 cans of soft yesterday,what was the total profit made? 一道GMAT数学题求解.If y≠3 and 3x/y is a prime integer greater than 2,which of the following must be true?1.x=y2.y=13.x and y are prime integers.A NoneB 1 onlyC 2 onlyD 3 onlyE 1 and 3答案给出的是A，我觉得选B，请问条件1有什 紧急!12月考 20135月SAT数学If the circumference of a cir le is doubled when its radius r is increased by 4 inches, what is the value of r, in inches?3y=2x-6 y=1-cxIn the equations above,x and y are variables and c is a constant. If no ordered three grades of milk are 1percent,2percent,3percent fat by volume,if x gallon of 1 percent,y gallon of 2percent and z gallon of 3percent are mixed to give x+y+z gallons of a 1.5percent grade ,what is x in terms of y and 1．　If　x　and　y　are　integers　and　xy＋x＾2　is　oddh　which　of　the　following　statements　must　be　true?①　x　is　odd②　y　is　odd③　x＋y　is　oddA．　①B．　③C．　①　and　②D．　①　an If y = f(u) and u = g(x),where f and g are twice differentiable functions,show thatd2y/dx2 =d2y/du2 (du/dx)＾2 +dy/du(d2u/dx2)f 和 g 两次微分 gmat数学DS部分 prep上的一道题,gmat数学DS部分 prep上的一道题,也看不到答案.177.If x and y are positive integers,what is the value of xy (1) The greatest common factor of x and y is 10.(2) The least common multiple of x and y is If you are my one and If x and y are positive integers such that x=8y+12,what is the greatest common divisor of x and 1) x=12u,where u is an integer2) y=12z,where z is 由题知:x=4(2y+3)由(1)知:x=12u 则y=3k k is an integer.x=12(2k+1) 则x,y最大公因子不能确定. 将分段函数y=x(x=0and x10)编程用if else 语句 1.In a group of six people,two have a mass of 60kg while three have a mass one and half times that.what is the mass of the sixth person if the average group mass is 70kg?2.There are x dimes and y nickels in bag A and x nickels and y dimes in bag B.Th If two rational number x,y satisfy |x|+y=3 and |x|y+x*x=0 ,then x=___ y=___? If dy/dx=2y^2 and if y= -1 when x=1,then when x=2,y=? if the function f satisfies the equation f(x+y)=f(x)+f(y) for every pair of real numbers x and y,what are the possible values of f(0) A.any real numberB.any positive real numberC.0 and 1 onlyD.1 onlyE.0 only 求解一道Gmat数据充分题If x and y are integers,is y an even integer?(1) 2y – x = x^2 – y^2(2) x is an odd integer.条件（1）单独就是充分的