x+y=45,24x+18y=960
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x+y=45,24x+18y=960
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
18x+6y=24 x=y
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
y=x(x
X+X+X+X+Y+Y+Y=36,X+X+Y+Y+Y=24,那么X=【】,Y等于【】.【】
x+x+x+x+y+y+y=56
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