4.
ÆÀ·Ö˵Ã÷¼°²Î¿¼´ð°¸Ò»¡¢Ã¿¿Õ1·Ö£¬¹²50·Ö 1¡¢ 9£¬11£¬15£» 2¡¢ ¡õ£¬4£¬12£¬7£¬2£¬7£¬¡ð£¬3£» 3¡¢8£¬10£¬12£»15£¬20£¬25£»7£¬4£¬1£»4¡¢1£¬4£¬20£» 5¡¢£½¡¢£¼¡¢£¼¡¢£½¡¢£¼¡¢£¼¡£6¡¢´ð°¸ÂÔ£»7¡¢8£¬5£¬11£¬39¡¢12£¬3£¬8£¬7£¬9£¬4£¬2£¬4£» ¶þ¡¢Ã¿Ìâ3·Ö£¬¹²12·Ö¡£
3£¬20£¬
Èý¡¢Ã¿Ìâ1·Ö£¬¹²6·Ö¡£11£¬10£¬13£¬6£¬8£¬8 ËÄ¡¢¹²7·Ö¡£
1¡¢Ã¿ÌõÏß1·Ö£¬¹²3·Ö¡£´ð°¸ÂÔ¡£
2¡¢Ã¿¿Õ0.5·Ö£¬¹²4·Ö¡£4£¬2£¬2£¬2£¬Ô²Öù£¬³¤·½Ì壬Õý·½Ì壬Çò£»
Îå¡¢¹²25·Ö¡£
1¡¢3+5+2=10£»£¨ÆäÖÐÁÐʽռ2·Ö£¬¼ÆËãÕ¼2·Ö£¬¹²4·Ö£© 2¡¢8+8=16£» £¨ÆäÖÐÁÐʽռ2·Ö£¬¼ÆËãÕ¼2·Ö£¬¹²4·Ö£© 3¡¢16-6-4=10 £»£¨ÆäÖÐÁÐʽռ2·Ö£¬¼ÆËãÕ¼2·Ö£¬¹²4·Ö£© 4¡¢10-4=6£»£¨ÆäÖÐÁÐʽռ2·Ö£¬¼ÆËãÕ¼2·Ö£¬¹²4·Ö£© 5¡¢¹²9·Ö¡£
(1)5+6=11£¨ÆäÖÐÁÐʽռ2·Ö£¬¼ÆËãÕ¼1·Ö£¬¹²3·Ö£© (2)10-6=4 £¨ÆäÖÐÁÐʽռ2·Ö£¬¼ÆËãÕ¼1·Ö£¬¹²3·Ö£© (3)9-4=5 £¨ÆäÖÐÁÐʽռ2·Ö£¬¼ÆËãÕ¼1·Ö£¬¹²3·Ö£©