设ï¼ç²æ¤äºX棵ï¼ä¹æ¤äºy棵ï¼ä¸æ¤äºZ棵ï¼åæï¼
X+y+Z=50 â
y=1/4(X+Z) â¡
X=y+Z â¢
æè·¯ï¼å
æ³æ³æ¶é¤å
¶ä¸ä¸ä¸ªæªç¥æ°ï¼ä½¿ä¸å
åæäºå
ã
å°â¢åå«ä»£å
¥â ï¼â¡ä¸å¾ï¼
y+Z+y+Z=50
2y+2Z=50 â£
y=1/4(y+Z+Z)
y-1/4y=1/2Z
3/4y=1/2Z
Z=3/2y â¤
å°â¤ä»£å
¥â£å¾
2y+2(3/2y)=50
5y=50
y=10ï¼æ£µï¼
代å
¥â¤å¾
Z=3/2x10=15ï¼æ£µï¼
æå代å
¥â å¾
â
©+10+15=50
â
©=25ï¼æ£µï¼ã
温馨提示:答案为网友推荐,仅供参考