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.
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