小马虎做一道减法题时把78看成87
小马虎在做一道减法题时,把被减数百位上的6看成4,结果得到的差是212,正确的差是多少?4.小马虎在做减法题时,把被减数十位上的3写成8结果得到的差哪吒是个小马虎,他在做一道减法题时,把被减数十位上的7错写成8,减数个位上的7错写成2,最后所得的差是577,那么这道题的正确答案应该是多少呢?
1 、xiao ma hu zuo yi dao jian fa ti shi ,ba bei jian shu shi wei shang de 5 dang zuo 9 ,ba jian shu ge wei shang de 4 dang zuo le 6 ,jie guo (j i ē g u ǒ )de 9 7 ,zheng que da an shi duo shao ?2 、xiao rui zuo yi dao jian fa ti shi ,bu xi xin " 1、小马虎做一道减法题时,把被减数十位上的5当做9,把减数个位上的4当做了6,结果(jiē guǒ)得97,正确答案是多少?2、小蕊做一道减法题时,不细心
na zha shi ge xiao ma hu ,ta zai zuo yi dao jian fa ti shi ,ba bei jian shu shi wei shang de 7 cuo xie cheng 8 ,jian shu ge wei shang de 7 cuo xie cheng 2 ,zui hou suo de de cha shi 5 7 7 ,na me zhe dao ti de zheng que da an ying gai shi duo shao ne ?" jie ti si lu :gen ju ti gan fen xi ke de ,xiao ma hu ba cheng shu 7 8 kan zuo 8 7 ,shi ba cheng shu zeng jia le 8 7 - 7 8 = 9 ,ze ji bi yuan lai zeng jia le 4 5 ,you ci ke yi xian qiu chu ling yi ge cheng shu shi :4 5 ÷ 9 = 5 ,you ci ke de zhe ge cheng fa suan shi shi :5 * "
ke yi she zhe ge shu wei X na me jiu you 8 7 X - 7 8 X = 9 1 8 jie chu zhe ge shu wei 1 02 suo yi zheng que de jie guo jiu shi 1 02 X 7 8 = 7 9 5 6 jie xi kan bu dong ? mian fei zha kan tong lei ti shi pin jie xi zha kan jie da 可以设这个数为X 那么就有87X-78X=918 解出这个数为102 所以正确的结果就是102X78=7956 解析看不懂?免费查看同类题视频解析查看解答
解题思路:根据题干分析可得,小马虎把乘数78看做87,是把乘数增加了87-78=9,则积比原来增加了45,由此可以先求出另一个乘数是:45÷9=5,由此可得这个乘法算式是:5*xiao ma hu zai zuo yi dao jian fa ti shi ,ba bei jian shu bai wei shang de 6 kan cheng 4 ,jie guo de dao de cha shi 2 1 2 ,zheng que de cha shi duo shao ?4 . xiao ma hu zai zuo jian fa ti shi ,ba bei jian shu shi wei shang de 3 xie cheng 8 jie guo de dao de cha "