{x+y=200 {20%+80%=200×44%
有这样一道题:计算(x-y)[(x+y)(x+y)-xy]+(x+y)[(x-y)(x-y)+xy]的值,其中x=200
200X+(20-X)*250+(24-X)*150+(6+X)*180=Y
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
x+y=17 x+x+y+y+y+y=44问x和y各是多少
有这样一道题,计算:(x-y)[(x+y)(x+y)-xy]-(x-y)[(x-y)(x-y)+xy]的值,其中x=20
X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少?
x-80=y,(1-25%)x+30=(1+20%)y问x=?y=?
X+Y= - 20 ,X-Y=80,求X和Y的值,要求用JAVA程序计算出来 .
已知方程组2006(X-Y)+2007(Y-Z)-2008(X-Z)=0,2006*2006(X-Y)+2007*200
x+80%y=42 y-x=12