题目内容
计算(能简算的要简算)
÷4+
×
3-
×
÷
(
+
)×48
÷(
×
)
[
+7÷(
-
)]×
.
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 4 |
3-
| 49 |
| 15 |
| 15 |
| 7 |
| 14 |
| 5 |
(
| 5 |
| 24 |
| 7 |
| 11 |
| 27 |
| 6 |
| 18 |
| 5 |
| 15 |
| 34 |
[
| 3 |
| 5 |
| 11 |
| 12 |
| 5 |
| 8 |
| 5 |
| 24 |
分析:(1)根据乘法分配律进行简算;
(2)先算乘法,再算除法,最后算减法;
(3)根据乘法分配律进行简算;
(4)先算乘法,再算除法;
(5)先算减法,再算除法,再算加法,最后算乘法.
(2)先算乘法,再算除法,最后算减法;
(3)根据乘法分配律进行简算;
(4)先算乘法,再算除法;
(5)先算减法,再算除法,再算加法,最后算乘法.
解答:解:
(1)
÷4+
×
,
=
×
+
×
,
=(
+
)×
,
=
;
(2)3-
×
÷
,
=3-7÷
,
=3-
,
=
;
(3)(
+
)×48,
=
×48+
×48,
=10+30
,
=40
;
(4)
÷(
×
),
=
÷
,
=
;
(5)[
+7÷(
-
)]×
,
=[
+7÷
]×
,
=[
+24]×
,
=24
×
,
=5
.
(1)
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 4 |
=
| 5 |
| 12 |
| 1 |
| 4 |
| 7 |
| 12 |
| 1 |
| 4 |
=(
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 4 |
=
| 1 |
| 4 |
(2)3-
| 49 |
| 15 |
| 15 |
| 7 |
| 14 |
| 5 |
=3-7÷
| 14 |
| 5 |
=3-
| 5 |
| 2 |
=
| 1 |
| 2 |
(3)(
| 5 |
| 24 |
| 7 |
| 11 |
=
| 5 |
| 24 |
| 7 |
| 11 |
=10+30
| 6 |
| 11 |
=40
| 6 |
| 11 |
(4)
| 27 |
| 6 |
| 18 |
| 5 |
| 15 |
| 34 |
=
| 27 |
| 6 |
| 27 |
| 17 |
=
| 17 |
| 6 |
(5)[
| 3 |
| 5 |
| 11 |
| 12 |
| 5 |
| 8 |
| 5 |
| 24 |
=[
| 3 |
| 5 |
| 7 |
| 24 |
| 5 |
| 24 |
=[
| 3 |
| 5 |
| 5 |
| 24 |
=24
| 3 |
| 5 |
| 5 |
| 24 |
=5
| 3 |
| 24 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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