已知x\/y=3\/2,则x-y\/x+y=
x=3k, y=2k 所以x-y\/x+y=(3k-2k)\/(3k+2k)=1\/5
已知x\/y等于3\/2则x-y\/x+y等于多少?
x=3/2y,X=1.5y (x-y)/(x+y)=(1.5y-y)/(1.5y+y)=0.5/2.5 =1/5
已知x\/y=2\/3,则x-y\/x+y=?
x-y\/x+y= (2\/3y-y)\/(2\/3y+y)=-1\/3÷5\/3=-1\/5
比例线段:已知x\/y=2\/3,则 x\/x+y= ,x-y\/x+y= 要过程!
y=3x\/2 所以 x\/(x+y)=x\/(x+3x\/2)=1\/(1+3\/2)=2\/5 (x-y)\/(x+y)=(x-3x\/2)\/(x+3x\/2)=(-1\/2)\/(5\/2)=-1\/5
已知x\/y=2\/3,求3x-y\/x+2y的值
x=2\/3y 2y-y\/2\/3y+2y=3\/8
已知X\/Y=3,求X+Y\/X-Y的值
∵X\/Y=3 ∴X=3Y ∴(X+Y\/X-Y)=(3Y+Y)\/(3Y-Y)=2
已知x\/y=2\/3,求2x+3y\/x+y的值
你好 y在条件的分母,所以不等于0(2x+3y)\/(x+y)分子分母同除以y得(2x\/y+3)\/(x\/y+1)=(4\/3+3)\/(2\/3+1)=(13\/3)\/(5\/3)=13\/5 很高兴为您解答,祝你学习进步!有不明白的可以追问!如果有其他问题请另发或点击...
已知x\/y=3\/2求代数式4x-9y\/2x+3y
x\/y=3\/2 则2x=3y 带进去就变成6y-9y\/(3y+3y)=-1\/2y 感觉怪怪的.一般都是转换下形式然后带进去 这题怎么没一般项- - 或者直接将x=3 y=2 带进去
已知(x+y)\/(x-y)=3\/2,则(x²+y²)\/xy =
(x+y)\/(x-y)=3\/2 2(x+y)=3(x-y)2x+2y=3x-3y x=5y (x²+y²)\/xy =(25y²+y²)÷(5y²)=26\/5
若x\/y=2,则分式(x-y)\/(x+y)=
分子分母同除以y,分子就是x\/y-y\/y。分母为x\/y+y\/y 也就是(2-1)\/(2+1)=1\/3