题目内容
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
15×(
| 1 |
| 3 |
| 1 |
| 12 |
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
分析:(1)运用加法交换律和结合律解答,
(2)运用乘法分配律解答,
(3)运用减法性质解答.
(2)运用乘法分配律解答,
(3)运用减法性质解答.
解答:解:(1)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(2)15×(
+
)
=15×
+15×
=5+1
=6
;
(3)
÷(3-
-
)
=
÷[3-(
+
)]
=
÷[3-1]
=
÷2
=
.
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=1+1
=2;
(2)15×(
| 1 |
| 3 |
| 1 |
| 12 |
=15×
| 1 |
| 3 |
| 1 |
| 12 |
=5+1
| 1 |
| 4 |
=6
| 1 |
| 4 |
(3)
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 8 |
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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