题目内容
脱式计算 10+
|
| ||||||||||||
(
|
|
分析:(1)运用加法结合律解答,
(2)运用加法交换律,以及减法性质解答,
(3)(4)运用乘法分配律解答.
(2)运用加法交换律,以及减法性质解答,
(3)(4)运用乘法分配律解答.
解答:解:(1)10+
+
=10+(
+
)
=10+1
=11;
(2)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(3)(
+
)×15
=
×15+
×15
=9+5
=14;
(4)
×
+
÷
=(
+
)×
=1×
=
.
5 |
7 |
2 |
7 |
=10+(
5 |
7 |
2 |
7 |
=10+1
=11;
(2)
1 |
2 |
1 |
4 |
1 |
2 |
3 |
4 |
=(
1 |
2 |
1 |
2 |
1 |
4 |
3 |
4 |
=1-1
=0;
(3)(
3 |
5 |
1 |
3 |
=
3 |
5 |
1 |
3 |
=9+5
=14;
(4)
11 |
13 |
5 |
8 |
3 |
8 |
13 |
11 |
=(
5 |
8 |
3 |
8 |
11 |
13 |
=1×
11 |
13 |
=
11 |
13 |
点评:本题考查知识点:正确运用简便方法解决问题.
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