1400÷25 1999+999×999 21÷9+22÷9+23÷9 用奥术简算法解答.
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1400÷25 1999+999×999 21÷9+22÷9+23÷9 用奥术简算法解答.
![1400÷25 1999+999×999 21÷9+22÷9+23÷9 用奥术简算法解答.](/uploads/image/z/18689634-18-4.jpg?t=1400%C3%B725+1999%2B999%C3%97999+21%C3%B79%2B22%C3%B79%2B23%C3%B79+%E7%94%A8%E5%A5%A5%E6%9C%AF%E7%AE%80%E7%AE%97%E6%B3%95%E8%A7%A3%E7%AD%94.)
1400÷25
=14×100÷25
=14×(100÷25)
=14×4
=56
1999+999×999
=1000+999+999×999
=1000+999×(1+999)
=1000+999×1000
=1000×(1+999)
=1000×1000
=1000000
21÷9+22÷9+23÷9
=(21+22+23)÷9
=66÷9
=22/3
祝学习快乐
=14×100÷25
=14×(100÷25)
=14×4
=56
1999+999×999
=1000+999+999×999
=1000+999×(1+999)
=1000+999×1000
=1000×(1+999)
=1000×1000
=1000000
21÷9+22÷9+23÷9
=(21+22+23)÷9
=66÷9
=22/3
祝学习快乐