题目内容
| 240÷600×100%= |
|
| ||||||||||||||||||
12×(
|
(
|
|
分析:(1)按照从左到右的顺序;
(2)先算乘法,再算加法;
(3)按照从左到右的顺序;
(4)运用乘法分配律简算;
(5)先算小括号里面的减法,再算括号外的除法;
(6)先算除法,然后再运用加法结合律简算.
(2)先算乘法,再算加法;
(3)按照从左到右的顺序;
(4)运用乘法分配律简算;
(5)先算小括号里面的减法,再算括号外的除法;
(6)先算除法,然后再运用加法结合律简算.
解答:解:(1)240÷600×100%,
=0.4×100%,
=0.4;
(2)
×
+
,
=
+
,
=1;
(3)
÷
÷5,
=
×
,
=
;
(4)12×(
+
),
=12×
+12×
,
=8+3,
=11;
(5)(
-
)÷
.
=0÷
,
=0;
(6)
+
÷
+
,
=
+
+
,
=
+
+
,
=1
.
=0.4×100%,
=0.4;
(2)
| 7 |
| 8 |
| 5 |
| 7 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 8 |
=1;
(3)
| 1 |
| 3 |
| 3 |
| 5 |
=
| 5 |
| 9 |
| 1 |
| 5 |
=
| 1 |
| 9 |
(4)12×(
| 2 |
| 3 |
| 1 |
| 4 |
=12×
| 2 |
| 3 |
| 1 |
| 4 |
=8+3,
=11;
(5)(
| 11 |
| 13 |
| 11 |
| 13 |
| 1 |
| 11 |
=0÷
| 1 |
| 11 |
=0;
(6)
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 1 |
| 4 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 4 |
=1
| 1 |
| 4 |
点评:这类型的题目先观察算式,看能不能运用简便运算的方法简算,若不能就要按照运算顺序逐步运算.
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