题目内容
计算下列各题,能简算的要简算.
| 137+63÷7 | (
|
7×5×(
|
|
分析:(1)先算除法,再算加法;
(2)运用乘法的分配律进行简算;
(3)运用乘法的分配律进行简算;
(4)先算小括号里的减法,再运用乘法的分配律进行简算.
(2)运用乘法的分配律进行简算;
(3)运用乘法的分配律进行简算;
(4)先算小括号里的减法,再运用乘法的分配律进行简算.
解答:解:(1)137+63÷7,
=137+9,
=146;
(2)(
+
)×
,
=
×
+
×
,
=2+
,
=2
;
(3)7×5×(
-
),
=7×5×
-7×5×
,
=10-7,
=3;
(4)
×[0.75-(
-
)],
=
×[0.75-
],
=
×0.75-
×
,
=
-
,
=
.
=137+9,
=146;
(2)(
| 22 |
| 9 |
| 11 |
| 10 |
| 9 |
| 11 |
=
| 22 |
| 9 |
| 9 |
| 11 |
| 11 |
| 10 |
| 9 |
| 11 |
=2+
| 9 |
| 10 |
=2
| 9 |
| 10 |
(3)7×5×(
| 2 |
| 7 |
| 1 |
| 5 |
=7×5×
| 2 |
| 7 |
| 1 |
| 5 |
=10-7,
=3;
(4)
| 8 |
| 9 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 16 |
=
| 8 |
| 9 |
| 8 |
| 9 |
| 3 |
| 16 |
=
| 2 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 2 |
点评:考查了整数、分数、小数四则混合运算顺序,灵活运用运算定律进行简算.
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