题目内容
计算下列各题,能简算的要简算.
(
|
|
| ||||||||||||||||||
|
|
32.6×
|
分析:(1)运用乘法的分配律进行简算;
(2)把除以5化成乘以
,再约分计算,最后算加法;
(3)运用乘法的分配律进行简算;
(4)先同时计算出乘法算式和除法算式,再算减法;
(5)把除以6化成乘以
,再运用乘法的分配律进行简算;
(6)运用乘法的分配律进行简算.
(2)把除以5化成乘以
| 1 |
| 5 |
(3)运用乘法的分配律进行简算;
(4)先同时计算出乘法算式和除法算式,再算减法;
(5)把除以6化成乘以
| 1 |
| 6 |
(6)运用乘法的分配律进行简算.
解答:解:(1)(
+
)×30,
=
×30+
×30,
=25+24,
=49;
(2)
÷5×
+
,
=
×
×
+
,
=
+
,
=
;
(3)
×
+
×
,
=
×(
+
),
=
×2,
=
;
(4)
×
-
÷
,
=
-
,
=
;
(5)
×
+
÷6,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(6)32.6×
+32.6×20%,
=32.6×(
+20%),
=32.6×1,
=32.6;
| 5 |
| 6 |
| 4 |
| 5 |
=
| 5 |
| 6 |
| 4 |
| 5 |
=25+24,
=49;
(2)
| 8 |
| 9 |
| 5 |
| 6 |
| 2 |
| 9 |
=
| 8 |
| 9 |
| 1 |
| 5 |
| 5 |
| 6 |
| 2 |
| 9 |
=
| 4 |
| 27 |
| 2 |
| 9 |
=
| 10 |
| 27 |
(3)
| 3 |
| 4 |
| 5 |
| 12 |
| 5 |
| 12 |
| 5 |
| 4 |
=
| 5 |
| 12 |
| 3 |
| 4 |
| 5 |
| 4 |
=
| 5 |
| 12 |
=
| 5 |
| 6 |
(4)
| 8 |
| 15 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 2 |
=
| 2 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 15 |
(5)
| 5 |
| 7 |
| 1 |
| 6 |
| 2 |
| 7 |
=
| 5 |
| 7 |
| 1 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 6 |
=1×
| 1 |
| 6 |
=
| 1 |
| 6 |
(6)32.6×
| 4 |
| 5 |
=32.6×(
| 4 |
| 5 |
=32.6×1,
=32.6;
点评:此题考查了分数、小数四则混合运算的顺序,注意运算定律的运用,能简算的要简算.
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