题目内容
计算下面各題
|
|
|
|
分析:(1)同时运算除法和乘法,再算加法;
(2)先算乘法,再算减法,最后算加法;
(3)运用乘法分配律简算;
(4)先算小括号里面的减法,再算中括号里面的除法,最后算括号外的除法.
(2)先算乘法,再算减法,最后算加法;
(3)运用乘法分配律简算;
(4)先算小括号里面的减法,再算中括号里面的除法,最后算括号外的除法.
解答:解:(1)
÷
+
×
,
=
+
,
=
;
(2)
-
×
+
,
=
-
+
,
=
+
,
=
;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
÷[(
-
)÷
],
=
÷[
÷
],
=
÷
,
=
.
| 5 |
| 9 |
| 1 |
| 6 |
| 4 |
| 7 |
| 7 |
| 12 |
=
| 10 |
| 3 |
| 1 |
| 3 |
=
| 11 |
| 3 |
(2)
| 5 |
| 6 |
| 4 |
| 9 |
| 3 |
| 4 |
| 3 |
| 7 |
=
| 5 |
| 6 |
| 1 |
| 3 |
| 3 |
| 7 |
=
| 1 |
| 2 |
| 3 |
| 7 |
=
| 13 |
| 14 |
(3)
| 3 |
| 10 |
| 6 |
| 7 |
| 6 |
| 7 |
| 7 |
| 10 |
=(
| 3 |
| 10 |
| 7 |
| 10 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
(4)
| 7 |
| 25 |
| 4 |
| 5 |
| 7 |
| 10 |
| 5 |
| 8 |
=
| 7 |
| 25 |
| 1 |
| 10 |
| 5 |
| 8 |
=
| 7 |
| 25 |
| 4 |
| 25 |
=
| 7 |
| 4 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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