题目内容
42
-(19÷4
+11)-14
.
| 5 |
| 7 |
| 1 |
| 3 |
| 8 |
| 13 |
分析:本题先根据四则混合运算的运算顺序计算即可:先算括号中的除法,再算括号中的加法,然后再根据一个数减两个数,等于减去这两个数的和减法性质计算.
解答:解:42
-(19÷4
+11)-14
=42
-[19×
+11]-14
,
=42
-[4
+11]-14
,
=42
-15
-14
,
=42
-(15
+14
),
=42
-30,
=12
.
| 5 |
| 7 |
| 1 |
| 3 |
| 8 |
| 13 |
=42
| 5 |
| 7 |
| 3 |
| 13 |
| 8 |
| 13 |
=42
| 5 |
| 7 |
| 5 |
| 13 |
| 8 |
| 13 |
=42
| 5 |
| 7 |
| 5 |
| 13 |
| 8 |
| 13 |
=42
| 5 |
| 7 |
| 5 |
| 13 |
| 8 |
| 13 |
=42
| 5 |
| 7 |
=12
| 5 |
| 7 |
点评:完成本题要细心,注意通分、约分.
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