题目内容
算对了,才有压岁钱.

综合算式:
-
×(
÷
)=
-
×(
÷
)=
.
综合算式:
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
| 19 |
| 80 |
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
| 19 |
| 80 |
分析:先算
÷
=
,再算
×
=
,最后算
-
=
.因此,综合算式为
-
×(
÷
)=
.
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 9 |
| 16 |
| 4 |
| 5 |
| 9 |
| 16 |
| 19 |
| 80 |
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
| 19 |
| 80 |
解答:解:

-
×(
÷
)
=
-
×(
×
)
=
-
×
=
-
=
.
故答案为:
-
×(
÷
)=
.
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
| 3 |
| 2 |
=
| 4 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
=
| 4 |
| 5 |
| 9 |
| 16 |
=
| 19 |
| 80 |
故答案为:
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
| 19 |
| 80 |
点评:先观察树状图,搞清运算顺序,进而解决问题.
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