题目内容
脱式计算:
(1)6÷
|
(2)
|
分析:(1)把除法变为乘法,先算乘法,再算减法;
(2)先算小括号内的,再算中括号内的,最后算括号外的.
(2)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)6÷
-
÷6,
=6×
-
×
,
=20-
,
=19
;
(2)
+[
×(
-
)],
=
+[
×
],
=
+
,
=
.
| 3 |
| 10 |
| 3 |
| 10 |
=6×
| 10 |
| 3 |
| 3 |
| 10 |
| 1 |
| 6 |
=20-
| 1 |
| 20 |
=19
| 19 |
| 20 |
(2)
| 1 |
| 4 |
| 5 |
| 6 |
| 4 |
| 5 |
| 2 |
| 3 |
=
| 1 |
| 4 |
| 5 |
| 6 |
| 2 |
| 15 |
=
| 1 |
| 4 |
| 1 |
| 9 |
=
| 13 |
| 36 |
点评:此题主要考查了学生对分数四则混合运算的运算顺序的掌握与运用.
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