7x:4y,x:y=( ):(
1.x+x+x+y+y=6.4 y+y+y+x+x=7.1 x= ( ) y=( ) 2.1,4,7,10,13……这串
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
x/7=4/y x y成什么比例?
方程2分之x+y+2分之x-y=7,4(x+y)-5(x-y)=2
4x-(2x+y+16)/2=-6y 2x+3y=7-x-2y
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
x-4y分之3x + 4y-x分之x+y - x*x-4y分之7y
int x,y,z; x=2; y=4; z=7; x=y--
X-Y=4,绝对值X+绝对值Y=7,求X+Y=
已知X和Y满足3X+4Y=2,X-Y-1/7
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7