题目内容
计算(能简算的一定要简算)
(1)1
×(0.5262÷0.03-1
+0.06)×(6.45-3
)
(2)1
×(2
-
)+17
÷
.
(1)1
| 1 |
| 29 |
| 13 |
| 30 |
| 11 |
| 20 |
(2)1
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
| 11 |
| 12 |
| 17 |
| 21 |
分析:(1)先算第一个小括号里面的除法,然后把第一个小括号里面的运算运用加法交换律简算,再运用乘法结合律和乘法分配律简算;
(2)先算小括号里面的减法,再把除法变成乘法,运用乘法分配律简算.
(2)先算小括号里面的减法,再把除法变成乘法,运用乘法分配律简算.
解答:解:(1)1
×(0.5262÷0.03-1
+0.06)×(6.45-3
),
=1
×(17.54+0.06-1
)×(6.45-3
),
=1
×(17.6-1
)×(6.45-3
),
=[
×(
-
)]×(
-
),
=[
×
-
×
]×(
-
),
=[
-
]×
,
=
×
,
=48.5;
(2)1
×(2
-
)+17
÷
,
=1
×
+17
÷
.
=
×1
+17
×
,
=(1
+17
)×
,
=19
×
,
=
.
| 1 |
| 29 |
| 13 |
| 30 |
| 11 |
| 20 |
=1
| 1 |
| 29 |
| 13 |
| 30 |
| 11 |
| 20 |
=1
| 1 |
| 29 |
| 13 |
| 30 |
| 11 |
| 20 |
=[
| 30 |
| 29 |
| 88 |
| 5 |
| 43 |
| 30 |
| 129 |
| 20 |
| 71 |
| 20 |
=[
| 30 |
| 29 |
| 88 |
| 5 |
| 30 |
| 29 |
| 43 |
| 30 |
| 129 |
| 20 |
| 71 |
| 20 |
=[
| 528 |
| 29 |
| 43 |
| 29 |
| 29 |
| 10 |
=
| 485 |
| 29 |
| 29 |
| 10 |
=48.5;
(2)1
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
| 11 |
| 12 |
| 17 |
| 21 |
=1
| 4 |
| 17 |
| 23 |
| 12 |
| 11 |
| 12 |
| 17 |
| 21 |
=
| 21 |
| 17 |
| 11 |
| 12 |
| 11 |
| 12 |
| 21 |
| 17 |
=(1
| 11 |
| 12 |
| 11 |
| 12 |
| 21 |
| 17 |
=19
| 5 |
| 6 |
| 21 |
| 17 |
=
| 49 |
| 2 |
点评:本题考查了较复杂的四则混合运算,要注意分析式中数据,运用合适的简便方法计算.
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