题目内容
计算下面各题(能简算的要简算)
(
+
)÷(1-
)
+
×
+
×
+
×
(
-
)÷
×
.
(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 8 |
| 5 |
| 18 |
| 15 |
| 16 |
| 4 |
| 5 |
| 1 |
| 4 |
| 5 |
| 7 |
| 5 |
| 16 |
| 11 |
| 16 |
| 5 |
| 7 |
(
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 7 |
| 3 |
| 8 |
分析:(1)按照先同时计算括号里面的,再算括号外面的顺序解答;
(2)按照先算乘法,再运用加法结合律即可解答;
(3)运用乘法分配律解答;
(4)按照先算括号里面的,再按照从左到右顺序即可解答.
(2)按照先算乘法,再运用加法结合律即可解答;
(3)运用乘法分配律解答;
(4)按照先算括号里面的,再按照从左到右顺序即可解答.
解答:解:(1)(
+
)÷(1-
),
=
÷
,
=
;
(2)
+
×
+
,
=
+
+
,
=
+1,
=1
;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)(
-
)÷
×
,
=
÷
×
,
=
×
,
=
.
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 8 |
=
| 7 |
| 12 |
| 7 |
| 8 |
=
| 2 |
| 3 |
(2)
| 5 |
| 18 |
| 15 |
| 16 |
| 4 |
| 5 |
| 1 |
| 4 |
=
| 5 |
| 18 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 18 |
=1
| 5 |
| 18 |
(3)
| 5 |
| 7 |
| 5 |
| 16 |
| 11 |
| 16 |
| 5 |
| 7 |
=(
| 5 |
| 16 |
| 11 |
| 16 |
| 5 |
| 7 |
=1×
| 5 |
| 7 |
=
| 5 |
| 7 |
(4)(
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 7 |
| 3 |
| 8 |
=
| 2 |
| 15 |
| 2 |
| 7 |
| 3 |
| 8 |
=
| 7 |
| 15 |
| 3 |
| 8 |
=
| 7 |
| 40 |
点评:(1)依据四则运算顺序正确进行计算,(2)正确运用加法结合律解决问题,是本题考查知识点.
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