题目内容
怎样算简便就怎样算.
+
+
+
×
+
÷6
×
÷(
-
)
(
+
)×24
×
×
(1-
-
)÷
.
| 5 |
| 7 |
| 8 |
| 9 |
| 2 |
| 7 |
| 1 |
| 9 |
| 1 |
| 6 |
| 7 |
| 10 |
| 3 |
| 10 |
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
(
| 2 |
| 3 |
| 1 |
| 6 |
| 4 |
| 9 |
| 3 |
| 4 |
| 9 |
| 11 |
(1-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
分析:(1)运用加法交换律和结合律解答,
(2)(4)(6)运用乘法分配律解答,
(3)(5)运用乘法交换律解答.
(2)(4)(6)运用乘法分配律解答,
(3)(5)运用乘法交换律解答.
解答:解:(1)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(2)
×
+
÷6,
=(
+
)×
,
=1×
,
=
;
(3)
×
÷(
-
),
=
×
÷
,
=1×
,
=
;
(4)(
+
)×24,
=
×24+
×24,
=16+4,
=20;
(5)
×
×
,
=
×
×
,
=
×
,
=
;
(6)(1-
-
)÷
,
=1×8-
×8-
×8,
=8-4-2,
=2.
| 5 |
| 7 |
| 8 |
| 9 |
| 2 |
| 7 |
| 1 |
| 9 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 8 |
| 9 |
| 1 |
| 9 |
=1+1,
=2;
(2)
| 1 |
| 6 |
| 7 |
| 10 |
| 3 |
| 10 |
=(
| 7 |
| 10 |
| 3 |
| 10 |
| 1 |
| 6 |
=1×
| 1 |
| 6 |
=
| 1 |
| 6 |
(3)
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
=
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 3 |
=1×
| 3 |
| 4 |
=
| 3 |
| 4 |
(4)(
| 2 |
| 3 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 1 |
| 6 |
=16+4,
=20;
(5)
| 4 |
| 9 |
| 3 |
| 4 |
| 9 |
| 11 |
=
| 4 |
| 9 |
| 9 |
| 11 |
| 3 |
| 4 |
=
| 4 |
| 11 |
| 3 |
| 4 |
=
| 3 |
| 11 |
(6)(1-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
=1×8-
| 1 |
| 2 |
| 1 |
| 4 |
=8-4-2,
=2.
点评:(1)运用简便方法解决问题,(2)依据四则运算顺序正确进行计算,是本题考查知识点.
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