题目内容
计算题
(1)(7.6-3.6÷2)×1.5
(2)
+2
+
+3
(3)
-
÷
.
(1)(7.6-3.6÷2)×1.5
(2)
| 3 |
| 4 |
| 9 |
| 17 |
| 1 |
| 4 |
| 8 |
| 17 |
(3)
| 4 |
| 5 |
| 1 |
| 3 |
| 7 |
| 15 |
分析:(1)(3)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(2)先运用加法交换律,再运用加法结合律解答.
(2)先运用加法交换律,再运用加法结合律解答.
解答:解:(1)(7.6-3.6÷2)×1.5,
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(2)
+2
+
+3
,
=(
+
)+(2
+3
),
=1+6,
=7;
(3)
-
÷
,
=
-
,
=
.
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(2)
| 3 |
| 4 |
| 9 |
| 17 |
| 1 |
| 4 |
| 8 |
| 17 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
=1+6,
=7;
(3)
| 4 |
| 5 |
| 1 |
| 3 |
| 7 |
| 15 |
=
| 4 |
| 5 |
| 5 |
| 7 |
=
| 3 |
| 35 |
点评:本题主要考查学生运用四则运算计算方法的能力.
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