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所跟帖: ÈüÀ¥ µÚÒ»ÌâËÆºõÎ޽⡣   2021-09-23 23:28:58  


作者: ½Æß   ½âÒ»½âƽ½ÌÊÚµÄÎÊÌâ 2021-09-24 00:38:06  [点击:1380]
˵˵1

ƽڵʾ X ֵΪ½ǵֵѾ1 ŵڶ 11-X

ټٶϽǵֵY, ڶŵ Y-5. ϽǵĸֱַΪa,b,c,d. ͼ



ע⣬ ǰţ a+b = 7-y; c+d = 5+y, a+b+c+d = 12

ٿһڶУa+c+x =15, b+d +x =13. a+c =b+d +2. ǰ a+c b+d δ֪ 飬 ͿԵõΨһ⣺

a+c = 7, b+d = 5. x =8.һŵ 831.

ͬʱע⣬ Ͻ y \( 5\leq y \leq 7\).
y = 7, һŵ 007.
y = 6, һŵ 016 106.
y = 5, һŵ 025. 115 205.

Ҳ˵ 6ͬ⡣ мһŵֺ Ǹ Ǿǽ⡣ ʵϣ Ƕǽ⡣




���༭ʱ��: 2021-09-24 00:52:20

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