{y-2x/xy=5,5y+7x/xy=22}
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求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
{y-2x/xy=5,5y+7x/xy=22}
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2xy+5y^2+( )=x^2+3xy
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|x|/x+y/|y|+xy/|xy|=
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若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之