题目内容
脱式计算(能简算的要简算)
|
5×
|
35×(
| ||||||||||||||||
|
(0.75-
|
6÷
|
分析:(1)运用乘法交换律解答,
(2)(3)运用乘法分配律解答,
(4)运用减法性质解答,
(5)按照先同时计算括号里面的,再算括号外面的顺序解答,
(6)按照先同时计算除法,再算减法顺序解答.
(2)(3)运用乘法分配律解答,
(4)运用减法性质解答,
(5)按照先同时计算括号里面的,再算括号外面的顺序解答,
(6)按照先同时计算除法,再算减法顺序解答.
解答:解:(1)
×
×
=
×
×
=
×
=1;
(2)5×
+
÷
=
×(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
.
| 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 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
=9;
(3)35×(
| 4 |
| 7 |
| 2 |
| 5 |
=35×
| 4 |
| 7 |
| 2 |
| 5 |
=20-14
=6;
(4)
| 4 |
| 5 |
| 4 |
| 11 |
| 7 |
| 11 |
=
| 4 |
| 5 |
| 4 |
| 11 |
| 7 |
| 11 |
=
| 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:依据四则运算计算方法正确进行计算,以及运用简便方法解决问题,是本题考查知识点.
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