题目内容
35×
+
×0.35
38÷7÷38
×75+
×75.
| 5 |
| 8 |
| 3 |
| 8 |
38÷7÷38
| 1 |
| 4 |
| 3 |
| 4 |
分析:(1)(3)运用乘法分配律简算;
(2)调整一下运算顺序,使计算简便,即38÷38÷7.
(2)调整一下运算顺序,使计算简便,即38÷38÷7.
解答:解:(1)35×
+
×35,
=35×(
+
),
=35×1,
=35;
(2)38÷7÷38,
=38÷38÷7,
=1÷7,
=
;
(3)
×75+
×75,
=(
+
)×75,
=1×75,
=75.
| 5 |
| 8 |
| 3 |
| 8 |
=35×(
| 5 |
| 8 |
| 3 |
| 8 |
=35×1,
=35;
(2)38÷7÷38,
=38÷38÷7,
=1÷7,
=
| 1 |
| 7 |
(3)
| 1 |
| 4 |
| 3 |
| 4 |
=(
| 1 |
| 4 |
| 3 |
| 4 |
=1×75,
=75.
点评:仔细观察算式特点,运用运算定律或运算技巧,灵活解答.
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