整数X,Y满足方程2XY+X+Y=83,那么X+Y为何值?请带上解此题的过程...
问题描述:
整数X,Y满足方程2XY+X+Y=83,那么X+Y为何值?请带上解此题的过程...
整数X,Y满足方程2XY+X+Y=83,那么X+Y为何值?
答
2xy+x+y=83 4xy+2x+2y=166 (2x+1)(2y+1)=167=167*1或(-167)*(-1) 由于x,y均为整数,故"2x+1","2y+1"也均为整数,所以:当2x+1=167,2y+1=1或2x+1=1,2y+1=167时:x+y=83; 当2x+1=-167,2y+1=-1或2x+1=-1,2y+1=-167时:x+y...