题目内容
计算(要求脱式计算)
(1)(5
+18
-7
)÷16
(2)(3
+2
)÷2
-
×2
+5
.
(1)(5
| 3 |
| 8 |
| 1 |
| 2 |
| 5 |
| 24 |
| 2 |
| 3 |
(2)(3
| 1 |
| 4 |
| 1 |
| 6 |
| 3 |
| 5 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
分析:(1)括号内通分计算,结果为16
,这时,被除数与除数相同,故结果为1;
(2)先算括号内的和括号外的乘法,再算括号外的除法,最后算减法和加法.
| 2 |
| 3 |
(2)先算括号内的和括号外的乘法,再算括号外的除法,最后算减法和加法.
解答:解:(1)(5
+18
-7
)÷16
,
=(5
+18
-7
)÷16
,
=16
÷16
,
=1;
(2)(3
+2
)÷2
-
×2
+5
,
=
×
-
×
+5
,
=
-
+5
,
=5
.
| 3 |
| 8 |
| 1 |
| 2 |
| 5 |
| 24 |
| 2 |
| 3 |
=(5
| 9 |
| 24 |
| 12 |
| 24 |
| 5 |
| 24 |
| 2 |
| 3 |
=16
| 2 |
| 3 |
| 2 |
| 3 |
=1;
(2)(3
| 1 |
| 4 |
| 1 |
| 6 |
| 3 |
| 5 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 65 |
| 12 |
| 5 |
| 13 |
| 2 |
| 3 |
| 9 |
| 4 |
| 1 |
| 6 |
=
| 25 |
| 12 |
| 3 |
| 2 |
| 1 |
| 6 |
=5
| 3 |
| 4 |
点评:脱式计算,掌握运算顺序和运算法则是解题的关键.
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