若(5x+y)(7x+10y)=1/2,则x/y=______;若x+1/x=3,则x^2+1/x^2
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若2x+3y-1=y-x-8=x+6,则2x-y=______.
若7x+10y分之5x+y=1/2,则x/y=
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
若全集I={(x,y)|x,y∈R},集合M={(x,y)|(y-3)/(x-2)},N{(x,y)|y=x=1},则(
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
若3x-4y=0,则x/y=______,(x-y)/y=______,(3x+2y)/(2x+3y)=_____.
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
若|x-y+2|与(x+y-1)2互为相反数,则x=______,y=______.