神机妙算(写出简算过程)2005×20032004(3-15+27)×5×799989+9989+989+13.-六年级数学
题文
神机妙算(写出简算过程) 2005×
(3-
999
|
答案
(1)2005×
=(2004+1)×
=2004×
=2003+
=2003
(2)(3-
=(3-
=35×3-35×
=105-7+10, =98+10, =108; (3)999
=999
=(999
|
题文
神机妙算(写出简算过程) 2005×
(3-
999
|
答案
(1)2005×
=(2004+1)×
=2004×
=2003+
=2003
(2)(3-
=(3-
=35×3-35×
=105-7+10, =98+10, =108; (3)999
=999
=(999
|