9999*7778+3333*6666 简便计算老师提示我把后边的式子拆一下,与前边的式子结合,
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![9999*7778+3333*6666 简便计算老师提示我把后边的式子拆一下,与前边的式子结合,](/uploads/image/z/112006-46-6.jpg?t=9999%2A7778%2B3333%2A6666+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E8%80%81%E5%B8%88%E6%8F%90%E7%A4%BA%E6%88%91%E6%8A%8A%E5%90%8E%E8%BE%B9%E7%9A%84%E5%BC%8F%E5%AD%90%E6%8B%86%E4%B8%80%E4%B8%8B%EF%BC%8C%E4%B8%8E%E5%89%8D%E8%BE%B9%E7%9A%84%E5%BC%8F%E5%AD%90%E7%BB%93%E5%90%88%EF%BC%8C)
9999*7778+3333*6666 简便计算老师提示我把后边的式子拆一下,与前边的式子结合,
9999*7778+3333*6666 简便计算
老师提示我把后边的式子拆一下,与前边的式子结合,
9999*7778+3333*6666 简便计算老师提示我把后边的式子拆一下,与前边的式子结合,
9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
你的老师说的是对的,就是把3333*6666拆成3333*3*2222,再变成9999*2222,就和前面有公共项9999了.再用乘法的结合律,提取公共项9999,括号里是2222+7778=10000
9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
9999*7778+3333*6666
=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000
原式= 9999×7778 + 3333×3×2222
= 9999×7778 + 9999×2222
=9999×(7778+2222)
= 9999×10000
= 99990000
就用计算器算呗