9.5+9=?

9.5+9
=(9+9)+0.5
=18+0.5
=18.5
如不懂,可先把小數點的數拿開,解了正數,才解小數
或
不管小數,把9.5當作95(95=9.5X10),把9當作90(90=9X10),加完後再減化,加回小數點

9.5
+9.0
----------
18.5

9.5+9=18.5

9.5+9
=(9+0.5)+9
=9+9+0.5
=18+0.5
=18.5

The anwens is 18.5.

9.5+9 =9+0.5+9 =2(9)+0.5 =18+0.5 =18.5

９．５＋９＝１８．５

9.5+9
=18.5 9.5
+ 9
18.5

９.5
+ 9.0
---------
18.5


１８.5呀　

=18.5

9.5+9=18.5