题目内容
(2012?平坝县)用递等式计算,能简算的要简算.
÷
-
×
13.54-6.88-3.12
(
+
)÷
+
.
6 |
7 |
3 |
14 |
6 |
5 |
2 |
3 |
13.54-6.88-3.12
(
3 |
8 |
1 |
4 |
1 |
2 |
4 |
5 |
分析:(1)(3)依据四则运算计算顺序,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,
(2)依据减法性质解答,
(2)依据减法性质解答,
解答:解:(1)
÷
-
×
,
=4-
,
=3
;
(2)13.54-6.88-3.12,
=13.54-(6.88+3.12),
=13.54-10,
=3.54;
(3)(
+
)÷
+
,
=
÷
+
,
=
+
,
=2
.
6 |
7 |
3 |
14 |
6 |
5 |
2 |
3 |
=4-
4 |
5 |
=3
1 |
5 |
(2)13.54-6.88-3.12,
=13.54-(6.88+3.12),
=13.54-10,
=3.54;
(3)(
3 |
8 |
1 |
4 |
1 |
2 |
4 |
5 |
=
5 |
8 |
1 |
2 |
4 |
5 |
=
5 |
4 |
4 |
5 |
=2
1 |
20 |
点评:本题主要考查学生依据四则运算计算方法,以及减法性质解决问题的能力,注意计算的准确性.
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