题目内容
计算下面各题,能简算的要简算
÷(
+
)
÷[
×(0.2+
)]
(
+
)×8+
57.5-4.25-15.75.
5 |
8 |
5 |
8 |
1 |
3 |
9 |
20 |
3 |
2 |
4 |
5 |
(
5 |
8 |
2 |
27 |
11 |
27 |
57.5-4.25-15.75.
分析:①②按照四则混合运算的顺序进行计算即可.③运用乘法的分配律进行解答即可.④运用减法的性质进行计算即可.
解答:解:①
÷(
+
),
=
÷(
+
),
=
×
,
=
;
②
÷[
×(0.2+
)],
=
÷[
×1],
=
×
,
=
;
③(
+
)×8+
,
=
×8+
×8+
,
=5+
,
=6;
④57.5-4.25-15.75,
=57.5-(4.25+15.75),
=57.5-20,
=37.5;
5 |
8 |
5 |
8 |
1 |
3 |
=
5 |
8 |
15 |
24 |
8 |
24 |
=
5 |
8 |
24 |
23 |
=
15 |
23 |
②
9 |
20 |
3 |
2 |
4 |
5 |
=
9 |
20 |
3 |
2 |
=
9 |
20 |
2 |
3 |
=
3 |
10 |
③(
5 |
8 |
2 |
27 |
11 |
27 |
=
5 |
8 |
2 |
27 |
11 |
27 |
=5+
27 |
27 |
=6;
④57.5-4.25-15.75,
=57.5-(4.25+15.75),
=57.5-20,
=37.5;
点评:本题考查了学生通过约分对分数四则混合运题目进行简算的能力
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