巧算 9999×8889+3333×3333 9992+999 91/3+991/3+9991/3+99991/3+22/3.
问题描述:
巧算
9999×8889+3333×3333 9992+999 9
+991 3
+9991 3
+99991 3
+21 3
. 2 3
答
(1)9999×8889+3333×3333
=9999×8889+9999×1111
=9999×(8889+1111)
=9999×10000
=99990000
(2)9992+999
=999×999+999
=999×(999+1)
=999×1000
=999000
(3)9
+991 3
+9991 3
+99991 3
+21 3
2 3
=9+
+99+1 3
+999+1 3
+9999+1 3
+2+1 3
2 3
=(9+99+999+9999+2)+(
+1 3
+1 3
+1 3
+1 3
)2 3
=10+100+1000+10000-4+2+2
=11110