有一道小学奥数1994*19951995+1995*19941994=?
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/07/11 17:52:39
有一道小学奥数1994*19951995+1995*19941994=?
是+的啊,记得我考的那张就是+的.......
是+的啊,记得我考的那张就是+的.......
![有一道小学奥数1994*19951995+1995*19941994=?](/uploads/image/z/16505664-24-4.jpg?t=%E6%9C%89%E4%B8%80%E9%81%93%E5%B0%8F%E5%AD%A6%E5%A5%A5%E6%95%B01994%2A19951995%2B1995%2A19941994%3D%3F)
问题认真看看吧
1994 X 19951995 + 1995 X 19941994
= 1994 X (1995X10001) + 1995 X (1994X10001)
= 1994 X1995 X10001 + 1995 X1994 X10001
= 2X 1994X 1995X 10001
或者
= 1994 X (1995 0000+ 1995) + 1995 X (1994 0000+ 1994)
= 1994X 1995 0000 + 1994 X 1995 + 1995X 1994 0000 + 1995 X 1994
= 2X 1994X 1995X 10000 + 2X 1994X 1995
= 2X 1994X 1995X 10001
1994 X 19951995 + 1995 X 19941994
= 1994 X (1995X10001) + 1995 X (1994X10001)
= 1994 X1995 X10001 + 1995 X1994 X10001
= 2X 1994X 1995X 10001
或者
= 1994 X (1995 0000+ 1995) + 1995 X (1994 0000+ 1994)
= 1994X 1995 0000 + 1994 X 1995 + 1995X 1994 0000 + 1995 X 1994
= 2X 1994X 1995X 10000 + 2X 1994X 1995
= 2X 1994X 1995X 10001