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> 整数x,y满足方程2xy+x+y=83,则x+y=______或______.-数学
整数x,y满足方程2xy+x+y=83,则x+y=______或______.-数学
题目简介
整数x,y满足方程2xy+x+y=83,则x+y=______或______.-数学
题目详情
整数x,y满足方程2xy+x+y=83,则x+y=______或 ______.
题型:填空题
难度:偏易
来源:不详
答案
∵2xy+x+y=83⇒4xy+2x+2y=166⇒4xy+2x+2y+1=167⇒(2x+1)(2y+1)=167,
∵167是质数,
∴
2x+1=1
2y+1=167
,
2x+1=-1
2y+1=-167
,
2x+1=167
2y+1=1
,
2x+1=-167
2y+1=-1
,
解得
x=0
y=83
,
x=83
y=0
,
x=-1
y=-84
,
x=-84
y=-1
∴x+y=83或者-85
故答案为83,-85.
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题目简介
整数x,y满足方程2xy+x+y=83,则x+y=______或______.-数学
题目详情
答案
∵167是质数,
∴
解得
∴x+y=83或者-85
故答案为83,-85.