题目内容
计算,能简算的要简算:
3×(
|
24×(
|
| ||||||||||||||||||
|
(
|
|
分析:(1)、(2)、(3)、(4)运用乘法分配律,使计算变简便;
(5)运用去掉括号变符号使计算变简便;
(6)先算括号里面的,再算括号外面的.
(5)运用去掉括号变符号使计算变简便;
(6)先算括号里面的,再算括号外面的.
解答:解:(1)3×(
+
)-
,
=
+
-
,
=
;
(2)24×(
+
+
),
=9+8+10,
=27;
(3)
÷7+
×
,
=(
+
)×
,
=
;
(4)
×28,
=
×(27+1),
=26+
,
=26
;
(5)(
-
)-(
-
),
=
-
-
+
,
=1-1,
=0;
(6)
÷〔
×(1-
)〕,
=
÷(
×
),
=
×2,
=
.
| 2 |
| 15 |
| 1 |
| 12 |
| 1 |
| 4 |
=
| 2 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
=
| 2 |
| 5 |
(2)24×(
| 3 |
| 8 |
| 1 |
| 3 |
| 5 |
| 12 |
=9+8+10,
=27;
(3)
| 9 |
| 17 |
| 1 |
| 7 |
| 8 |
| 17 |
=(
| 9 |
| 17 |
| 8 |
| 17 |
| 1 |
| 7 |
=
| 1 |
| 7 |
(4)
| 26 |
| 27 |
=
| 26 |
| 27 |
=26+
| 26 |
| 27 |
=26
| 26 |
| 27 |
(5)(
| 5 |
| 12 |
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 12 |
=
| 5 |
| 12 |
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 12 |
=1-1,
=0;
(6)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 5 |
| 8 |
| 4 |
| 5 |
=
| 4 |
| 5 |
=
| 8 |
| 5 |
点评:此题考查分数混合运算的顺序,按照分数混合运算的顺序进行计算,能简算的要简算.
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