题目内容
递等式计算(怎样简便就怎么计算)
÷(
-
)
×
÷(
-
)
×
-
÷5
6÷
-
÷6
36
×
÷(
+
)×
.
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
| 6 |
| 7 |
| 6 |
| 5 |
| 6 |
| 7 |
6÷
| 3 |
| 10 |
| 3 |
| 10 |
36
| 48 |
| 49 |
| 1 |
| 4 |
| 7 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
| 4 |
| 5 |
分析:(1)按照先算括号里面的,再算括号外面的顺序解答;
(2)按照先算括号里面的,再按照从左到右顺序计算;
(3)(5)运用乘法分配律解答;
(4)按照先同时计算除法,再算减法顺序解答;
(6)依据先算括号里面的,再按照从左到右顺序解答.
(2)按照先算括号里面的,再按照从左到右顺序计算;
(3)(5)运用乘法分配律解答;
(4)按照先同时计算除法,再算减法顺序解答;
(6)依据先算括号里面的,再按照从左到右顺序解答.
解答:解:(1)
÷(
-
)
=
÷
=1
;
(2)
×
÷(
-
)
=
×
÷
=
÷
=
;
(3)
×
-
÷5
=(
-
)×
=1×
=
;
(4)6÷
-
÷6
=20-1.8
=18.2;
(5)36
×
=36×
+
×
=9+
=9
;
(6)
÷(
+
)×
=
÷
×
=
×
=1
.
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
=
| 1 |
| 3 |
| 4 |
| 15 |
=1
| 1 |
| 4 |
(2)
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
=
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 3 |
=
| 3 |
| 4 |
(3)
| 6 |
| 7 |
| 6 |
| 5 |
| 6 |
| 7 |
=(
| 6 |
| 5 |
| 1 |
| 5 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
(4)6÷
| 3 |
| 10 |
| 3 |
| 10 |
=20-1.8
=18.2;
(5)36
| 48 |
| 49 |
| 1 |
| 4 |
=36×
| 1 |
| 4 |
| 48 |
| 49 |
| 1 |
| 4 |
=9+
| 12 |
| 49 |
=9
| 12 |
| 49 |
(6)
| 7 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
| 4 |
| 5 |
=
| 7 |
| 4 |
| 7 |
| 6 |
| 4 |
| 5 |
=
| 3 |
| 2 |
| 4 |
| 5 |
=1
| 1 |
| 5 |
点评:(1)依据四则运算顺序正确进行计算,(2)运用乘法分配律解决问题,是本题考查知识点.
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