(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY值一旦正确可得到500分!本人绝不撒谎
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(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY值一旦正确可得到500分!本人绝不撒谎(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY值一旦正确可得到500分!本人绝不撒谎
(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY值一旦正确可得到500分!本人绝不撒谎
(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY值
一旦正确可得到500分!本人绝不撒谎
(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY值一旦正确可得到500分!本人绝不撒谎
原式推得:
2x + x/y + xy = 1999
因为y不等于0,两边同时乘以y得到
2xy + x + xy^2 = 1999
即x(y^2 + 2y + 1)=1999
即x(y+1)^2=1999
因为1999是质数,只能分解成1999*1
x=1 或 y+1 =1
因为y不等于0,因此y+1=1
所以x=1
所以y+1=1999
所以y=1998
答:x=1 y=1998
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