用简便运算计算各题:1754-999 854+598例如这个: 1754-999 = = = =这题是四年级的问题如果你现在读五年级请帮忙 !!!!!!!!!!!!!请帮忙 !!!!!!!!!!!!!!!
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![用简便运算计算各题:1754-999 854+598例如这个: 1754-999 = = = =这题是四年级的问题如果你现在读五年级请帮忙 !!!!!!!!!!!!!请帮忙 !!!!!!!!!!!!!!!](/uploads/image/z/6851879-71-9.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E8%AE%A1%E7%AE%97%E5%90%84%E9%A2%98%3A1754-999++854%2B598%E4%BE%8B%E5%A6%82%E8%BF%99%E4%B8%AA%3A+++++1754-999++++%3D++++%3D++++%3D++++%3D%E8%BF%99%E9%A2%98%E6%98%AF%E5%9B%9B%E5%B9%B4%E7%BA%A7%E7%9A%84%E9%97%AE%E9%A2%98%E5%A6%82%E6%9E%9C%E4%BD%A0%E7%8E%B0%E5%9C%A8%E8%AF%BB%E4%BA%94%E5%B9%B4%E7%BA%A7%E8%AF%B7%E5%B8%AE%E5%BF%99+%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%E8%AF%B7%E5%B8%AE%E5%BF%99+%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81%EF%BC%81)
用简便运算计算各题:1754-999 854+598例如这个: 1754-999 = = = =这题是四年级的问题如果你现在读五年级请帮忙 !!!!!!!!!!!!!请帮忙 !!!!!!!!!!!!!!!
用简便运算计算各题:1754-999 854+598
例如这个:
1754-999
=
=
=
=
这题是四年级的问题
如果你现在读五年级请帮忙 !!!!!!!!!!!!!请帮忙 !!!!!!!!!!!!!!!
用简便运算计算各题:1754-999 854+598例如这个: 1754-999 = = = =这题是四年级的问题如果你现在读五年级请帮忙 !!!!!!!!!!!!!请帮忙 !!!!!!!!!!!!!!!
1754-999
= 1754-(1000-1)
=1754-1000+1
= 754+1
=755
854+598
=854+600-2
=1454-2
=1452
1754-999
=1754-(1000-1)
=1754-1000+1
=755
854+598
=854+(600-2)
=854+600-2
=1452
1754-999
=1754-(999+1-1)
=1754-1000+1
=754+1
=755
854+598
=854+(598+2-2)
=854+600-2
=1454-2
=1452
这种题目就是把一个接近整十整百整千的是化为整十整百整千使计算方便,这类题目要注意的是多加要减,多减要加。括...
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1754-999
=1754-(999+1-1)
=1754-1000+1
=754+1
=755
854+598
=854+(598+2-2)
=854+600-2
=1454-2
=1452
这种题目就是把一个接近整十整百整千的是化为整十整百整千使计算方便,这类题目要注意的是多加要减,多减要加。括号前面是-号要变号
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1754-999
=1754-1000+1
= 754+1
= 755
854+598
= 854+600-2
=1454-2
=1452
1754-999
=1754-(999+1)+1)
=1754-1000+1
=754+1
=755
854+598
= 854+600-2
=1454-2
=1452
1754-999
=1754-<999+1>-1
=1754-100-1
=1654