设实数m,n满足19m^2+20m+1=0,n^2+20n+19=0且mn不等于0,求2mn+3m+2/n的值
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设实数m,n满足19m^2+20m+1=0,n^2+20n+19=0且mn不等于0,求2mn+3m+2/n的值
设实数m,n满足19m2+20m+1=0,n2+20n+19=0,且mn不等于1,求(2mn+3m+2)/n的值
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