题目内容
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|
2-
|
分析:(1)运用乘法分配律解答,
(2)运用加法结合律解答,
(3)按照先算括号里面的,再算乘法,最后算加法顺序解答,
(4)运用减法性质解答.
(2)运用加法结合律解答,
(3)按照先算括号里面的,再算乘法,最后算加法顺序解答,
(4)运用减法性质解答.
解答:解:(1)
÷7+
×
=(
+
)×
=
×
=
;
(2)
+
÷
+
=
+(
+
)
=
+1
=1
;
(3)
×(
+
)+
=
×
+
=
+
=4
;
(4)2-
÷
-
=2-
-
=2-(
+
)
=2-2
=0.
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(2)
| 2 |
| 9 |
| 1 |
| 2 |
| 4 |
| 5 |
| 3 |
| 8 |
=
| 2 |
| 9 |
| 5 |
| 8 |
| 3 |
| 8 |
=
| 2 |
| 9 |
=1
| 2 |
| 9 |
(3)
| 12 |
| 5 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
=
| 12 |
| 5 |
| 19 |
| 12 |
| 4 |
| 5 |
=
| 19 |
| 5 |
| 4 |
| 5 |
=4
| 3 |
| 5 |
(4)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2
=0.
点评:本题考查知识点:(1)以及四则运算顺序正确进行计算,(2)运用简便方法解决问题.
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