X+Y=60 0.3X+0.6Y=.01*160A
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X+Y=600.3X+0.6Y=.01*160AX+Y=600.3X+0.6Y=.01*160AX+Y=600.3X+0.6Y=.01*160Ax=344/3y=-(164/3)
X+Y=60 0.3X+0.6Y=.01*160A
X+Y=60 0.3X+0.6Y=.01*160
A
X+Y=60 0.3X+0.6Y=.01*160A
x=344/3
y=-(164/3)
3(x+y)+2(x-y)=20 0.3x+0.6y=60 x=?y=?
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
X+Y=60 0.3X+0.6Y=.01*160A
x+x+x+y=60 .x-y=4
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x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
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