题目内容
计算下面各题,能用简便方法的要用简便方法计算.
(1)
|
(2)5×
|
(3)35×(
| ||||||||||||||||
(4)
|
(5)(0.75-
|
(6)6÷
|
分析:(1)根据乘法交换律进行计算;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算
(4)根据连减的性质进行计算;
(5)先算减法和加法,再算乘法;
(6)先算除法,再算减法.
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算
(4)根据连减的性质进行计算;
(5)先算减法和加法,再算乘法;
(6)先算除法,再算减法.
解答:解:
(1)
×
×
,
=
×
×
,
=
×
,
=1;
(2)5×
+
÷
,
=5×
+
×7,
=(5+7)×
,
=12×
,
=9;
(3)35×(
-
),
=35×
-35×
,
=20-14,
=6;
(4)
÷(3-
-
),
=
÷[3-(
+
)],
=
÷[3-1],
=
÷2,
=
;
(5)(0.75-
)×(
+
),
=
×
,
=
;
(6)6÷
-
÷6,
=7-
,
=6
.
(1)
| 44 |
| 9 |
| 3 |
| 8 |
| 6 |
| 11 |
=
| 44 |
| 9 |
| 6 |
| 11 |
| 3 |
| 8 |
=
| 8 |
| 3 |
| 3 |
| 8 |
=1;
(2)5×
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 7 |
=5×
| 3 |
| 4 |
| 3 |
| 4 |
=(5+7)×
| 3 |
| 4 |
=12×
| 3 |
| 4 |
=9;
(3)35×(
| 4 |
| 7 |
| 2 |
| 5 |
=35×
| 4 |
| 7 |
| 2 |
| 5 |
=20-14,
=6;
(4)
| 4 |
| 5 |
| 4 |
| 15 |
| 11 |
| 15 |
=
| 4 |
| 5 |
| 4 |
| 15 |
| 11 |
| 15 |
=
| 4 |
| 5 |
=
| 4 |
| 5 |
=
| 2 |
| 5 |
(5)(0.75-
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
(6)6÷
| 6 |
| 7 |
| 6 |
| 7 |
=7-
| 1 |
| 7 |
=6
| 6 |
| 7 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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