题目内容
| 3 |
| 8 |
| 4 |
| 5 |
| 3 |
| 8 |
| 5 |
| 4 |
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 5 |
6÷5×
| 5 |
| 6 |
4×
| 7 |
| 8 |
| 2 |
| 7 |
分析:(1)按照先同时计算第二级运算,再算第一级运算顺序解答,
(2)运用乘法交换律和结合律解答,
(3)运用加法交换律解答,
(4)(5)按照从左到右顺序解答.
(2)运用乘法交换律和结合律解答,
(3)运用加法交换律解答,
(4)(5)按照从左到右顺序解答.
解答:解:(1)
×
-
÷
=
-
=0;
(2)
×8÷
×8
=(
÷
)×(8×8)
=1×64
=64;
(3)
+6÷
-
=(
-
)+6÷
=0+36
=36;
(4)6÷5×
=
×
=1;
(5)4×
×
=
×
=1.
| 3 |
| 8 |
| 4 |
| 5 |
| 3 |
| 8 |
| 5 |
| 4 |
=
| 3 |
| 10 |
| 3 |
| 10 |
=0;
(2)
| 3 |
| 8 |
| 3 |
| 8 |
=(
| 3 |
| 8 |
| 3 |
| 8 |
=1×64
=64;
(3)
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 5 |
=(
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
=0+36
=36;
(4)6÷5×
| 5 |
| 6 |
=
| 6 |
| 5 |
| 5 |
| 6 |
=1;
(5)4×
| 7 |
| 8 |
| 2 |
| 7 |
=
| 7 |
| 2 |
| 2 |
| 7 |
=1.
点评:(1)依据四则运算顺序正确进行计算,(2)运用简便方法解决问题,是本题考查知识点.
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