题目内容
(2013?陇川县模拟)用递等式计算.
①2.3×1.5+4.5÷0.75 ②
+
÷
③(1+
)÷(1-
) ④
÷[
×(
+
)].
①2.3×1.5+4.5÷0.75 ②
| 1 |
| 6 |
| 2 |
| 7 |
| 3 |
| 7 |
③(1+
| 1 |
| 3 |
| 1 |
| 3 |
| 3 |
| 5 |
| 7 |
| 11 |
| 2 |
| 5 |
| 1 |
| 3 |
分析:本题按照先算乘除再算加减,有括号的先算括号里面的顺序运算.
解答:解:①2.3×1.5+4.5÷0.75
=3.45+6
=9.45;
②
+
÷
=
+
,
=
;
③(1+
)÷(1-
)
=
÷
,
=2;
④
÷[
×(
+
)]
=
÷[
×
]
=1
.
=3.45+6
=9.45;
②
| 1 |
| 6 |
| 2 |
| 7 |
| 3 |
| 7 |
=
| 1 |
| 6 |
| 2 |
| 3 |
=
| 5 |
| 6 |
③(1+
| 1 |
| 3 |
| 1 |
| 3 |
=
| 4 |
| 3 |
| 2 |
| 3 |
=2;
④
| 3 |
| 5 |
| 7 |
| 11 |
| 2 |
| 5 |
| 1 |
| 3 |
=
| 3 |
| 5 |
| 7 |
| 11 |
| 11 |
| 15 |
=1
| 2 |
| 7 |
点评:本题是考查基本运算法则,根据运算顺序计算.
练习册系列答案
相关题目