题目内容
(2010?葫芦岛)脱式计算,能简算的要简算.
0.125+3.7×
+
×5.3
(4.6÷5+0.4×0.2)×2.8
×[
÷(
-
)]
(
+
)×
+
.
0.125+3.7×
1 |
8 |
1 |
8 |
(4.6÷5+0.4×0.2)×2.8
9 |
10 |
5 |
9 |
1 |
2 |
1 |
6 |
(
21 |
25 |
14 |
15 |
5 |
7 |
1 |
3 |
分析:(1)可根据乘法分配律计算;
(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(4)可根据乘法分配律及加法结合律计算.
(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(4)可根据乘法分配律及加法结合律计算.
解答:解:(1)0.125+3.7×
+
×5.3
=0.125+3.7×0.125+0.125×5.3,
=0.125×(1+3.7+5.3),
=0.125×10,
=1.25;
(2)(4.6÷5+0.4×0.2)×2.8
=(0.92+0.08)×2.8,
=1×2.8,
=2.8;
(3)
×[
÷(
-
)]
=
×[
÷
],
=
×
,
=
;
(4)(
+
)×
+
=
×
+
×
+
,
=
+(
+
),
=
+1,
=1
.
1 |
8 |
1 |
8 |
=0.125+3.7×0.125+0.125×5.3,
=0.125×(1+3.7+5.3),
=0.125×10,
=1.25;
(2)(4.6÷5+0.4×0.2)×2.8
=(0.92+0.08)×2.8,
=1×2.8,
=2.8;
(3)
9 |
10 |
5 |
9 |
1 |
2 |
1 |
6 |
=
9 |
10 |
5 |
9 |
1 |
3 |
=
9 |
10 |
5 |
3 |
=
3 |
2 |
(4)(
21 |
25 |
14 |
15 |
5 |
7 |
1 |
3 |
=
21 |
25 |
5 |
7 |
14 |
15 |
5 |
7 |
1 |
3 |
=
3 |
5 |
2 |
3 |
1 |
3 |
=
3 |
5 |
=1
3 |
5 |
点评:完成本题要注意分析式中数据,然后运用合适的方法进行计算.
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