题目内容
脱式计算,能简算的要简算.
+
+
+(
-
)
+
+
-
-
+
-
(
+
)+(
+
).
| 1 |
| 4 |
| 3 |
| 10 |
| 1 |
| 6 |
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 3 |
| 5 |
| 8 |
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 8 |
| 9 |
| 13 |
| 4 |
| 7 |
| 5 |
| 13 |
| 3 |
| 7 |
(
| 1 |
| 14 |
| 2 |
| 5 |
| 9 |
| 14 |
| 3 |
| 5 |
分析:(1)(2)以及四则运算计算方法解答,
(3)(5)运用加法结合律,以及加法交换律解答,
(4)运用加法交换律,以及减法性质解答.
(3)(5)运用加法结合律,以及加法交换律解答,
(4)运用加法交换律,以及减法性质解答.
解答:解:(1)
+
+
,
=
+
,
=
;
(2)
+(
-
),
=
+
,
=
;
(3)
+
+
-
,
=(
-
)+(
+
),
=
+1,
=1.5;
(4)(
+
)+(
+
),
=(
+
)+(
+
),
=
+1,
=1
.
| 1 |
| 4 |
| 3 |
| 10 |
| 1 |
| 6 |
=
| 11 |
| 20 |
| 1 |
| 6 |
=
| 43 |
| 60 |
(2)
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 3 |
=
| 5 |
| 9 |
| 5 |
| 12 |
=
| 35 |
| 36 |
(3)
| 5 |
| 8 |
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 8 |
=(
| 5 |
| 8 |
| 1 |
| 8 |
| 5 |
| 12 |
| 7 |
| 12 |
=
| 1 |
| 2 |
=1.5;
(4)(
| 1 |
| 14 |
| 2 |
| 5 |
| 9 |
| 14 |
| 3 |
| 5 |
=(
| 1 |
| 14 |
| 9 |
| 14 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 5 |
| 7 |
=1
| 5 |
| 7 |
点评:本题主要考查学生正确运用简便算法,以及四则运算计算方法解决问题的能力.
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