x+y=500 84%x+60%y=500*72%解二元一次方程,还有一个解二元一次方程:x/3+y/4=1 x/4+y/3=1
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x+y=500 84%x+60%y=500*72%解二元一次方程,还有一个解二元一次方程:x/3+y/4=1 x/4+y/3=1
x+y=500 84%x+60%y=500*72%
解二元一次方程,还有一个解二元一次方程:x/3+y/4=1
x/4+y/3=1
x+y=500 84%x+60%y=500*72%解二元一次方程,还有一个解二元一次方程:x/3+y/4=1 x/4+y/3=1
x=250,y=250
x=12/7,y=12/7
一 x+y=500 ①
1.4x+y=600 ②
二 0.4x=100
x=250
y=250
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+x+x+y=60 .x-y=4
x=y+y+y x+y=84 x=189/y
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
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x+x+x+x+y+y+y=56
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x-y/x+y=(x-y)²/x²-y²(x≠y)
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D:y>=x,y