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第,1,招巧算,24,点,学习第,1,单元后使用,BS,三年级上册,一副扑克牌中抽去大小王剩下,52,张,任意抽取,4,张牌,用加、减、乘、除,(,可用括号,),把牌面上的数,3,,,3,,,6,,,10,算出,24,。每张牌必须用一次且只能用一次。,经典例题,38,24,46,24,10,12,24,3(10,63),24,(10,6)(3,3),24,10,(6,3,3),24,(10,63)3,83,24,规范解答:,(,答案不唯一,),1,2,3,4,提示,:,点击 进入题组训练,分解成两数之积,利用,38,24,,,46,24,,,212,24,求解,分解成两数之差求解,5,分解成两数之和求解,6,7,8,9,技 巧,1,分解成两数之积,利用,38,24,,,46,24,,,212,24,求解,1,将,3,,,3,,,5,,,6,四个数算出,24,。每个数必须用一次且只能用一次。,3(6,3,5),24,(1),根据,38,24,,,3,已有,将另三个数凑成,8,。,(2),根据,46,24,,,6,已有,将另三个数凑成,4,。,6(33,5),24,(3),还是根据,38,24,,把,3,和,8,各分成两数。,(,答案不唯一,),(6,3)(3,5),24,6(5,33),24,先把其中两数相乘,积不足,24,的用另两数补足,,使最后得数是,24,。,29,23,24,技 巧,2,分解成两数之和求解,2. 2,2,3,9,先把其中两数相乘,积不足,24,的用另两数补足,,使最后得数是,24,。,27,5,5,24,3. 2,5,5,7,28,24,24,先把其中两数相乘,积不足,24,的用另两数补足,,使最后得数是,24,。,4. 2,2,4,8,先把其中两数相乘,积不足,24,的用另两数补足,,使最后得数是,24,。,44,(9,1),24,5. 1,4,4,9,先把其中两数相乘,积超过,24,的用另两数割去,使最后得数是,24,。,技 巧,3,分解成两数之差求解,6. 1,2,5,5,55,(2,1),24,先把其中两数相乘,积超过,24,的用另两数割去,使最后得数是,24,。,39,31,24,(93,3)1,24,7. 1,3,3,9,(,答案不唯一,),先把其中两数相乘,积超过,24,的用另两数割去,使最后得数是,24,。,8. 2,3,3,10,310,23,24,先把其中两数相乘,积超过,24,的用另两数割去,使最后得数是,24,。,9. 1,5,7,10,57,(1,10),24,
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