3x-y=5,5y-1=3x+5
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3x-y=5,5y-1=3x+53x-y=5,5y-1=3x+53x-y=5,5y-1=3x+5根据前一个式子,得y=3x-5将它代入后边的式子得5(3x-5)-1=3x+515x-25-1=3x+5
3x-y=5,5y-1=3x+5
3x-y=5,5y-1=3x+5
3x-y=5,5y-1=3x+5
根据前一个式子,得y=3x-5 将它代入后边的式子 得
5(3x-5)-1=3x+5
15x-25-1=3x+5
15x-26=3x+5
12x=31
x=31/12
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
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{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
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5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
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(5x+3y)(3y-5x)-(4x-y)(4y+x)=
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4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
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x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5