题目内容
(2008?临川区)计算.
(1)(
+
)×5×7
(2)
×97-6×
(3)(1.6÷0.32)÷(3.5-2.25)
(4)
×[(
+
)×
].
(1)(
| 1 |
| 5 |
| 2 |
| 7 |
(2)
| 19 |
| 91 |
| 19 |
| 97 |
(3)(1.6÷0.32)÷(3.5-2.25)
(4)
| 5 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3 |
| 3 |
| 2 |
分析:依据分数四则运算顺序,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.
解答:解:(1)(
+
)×5×7,
=
×5×7,
=
×7,
=17;
(2)
×97-6×
,
=
-
,
=20
;
(3)(1.6÷0.32)÷(3.5-2.25),
=5÷1.25,
=4;
(4)
×[(
+
)×
],
=
×[
×
],
=
×
,
=1.
| 1 |
| 5 |
| 2 |
| 7 |
=
| 17 |
| 35 |
=
| 17 |
| 7 |
=17;
(2)
| 19 |
| 91 |
| 19 |
| 97 |
=
| 1843 |
| 91 |
| 114 |
| 97 |
=20
| 1857 |
| 8827 |
(3)(1.6÷0.32)÷(3.5-2.25),
=5÷1.25,
=4;
(4)
| 5 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3 |
| 3 |
| 2 |
=
| 5 |
| 4 |
| 8 |
| 15 |
| 3 |
| 2 |
=
| 5 |
| 4 |
| 4 |
| 5 |
=1.
点评:本题主要考查学生对于四则运算计算方法掌握.
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