题目内容
(2010?河池)用你喜欢的方法计算.
0.125×32×2.5
÷
﹢
÷13 18×[
-(
+
)
0.125×32×2.5
12 |
13 |
8 |
7 |
7 |
8 |
8 |
15 |
1 |
5 |
1 |
6 |
分析:(1)0.125×32×2.5,把32分解成8×4,再 根据乘法结合律进行简算;
(2)
÷
﹢
÷13,把除数转化为乘除数的倒数,再根据乘法分配律简算;
(3)18×[
-(
+
)],直接根据分数四则混合运算的运算顺序,利用分数四则运算的计算法则进行计算;
(2)
12 |
13 |
8 |
7 |
7 |
8 |
(3)18×[
8 |
15 |
1 |
5 |
1 |
6 |
解答:解:(1)0.125×32×2.5,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(2)
÷
﹢
÷13,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)18×[
-(
+
)],
=18×[
-
],
=18×[
-
],
=18×
,
=3.
=(0.125×8)×(4×0.25),
=1×1,
=1;
(2)
12 |
13 |
8 |
7 |
7 |
8 |
=
12 |
13 |
7 |
8 |
7 |
8 |
1 |
13 |
=(
12 |
13 |
1 |
13 |
7 |
8 |
=1×
7 |
8 |
=
7 |
8 |
(3)18×[
8 |
15 |
1 |
5 |
1 |
6 |
=18×[
8 |
15 |
11 |
30 |
=18×[
16 |
30 |
11 |
30 |
=18×
1 |
6 |
=3.
点评:此题主要考查运用整数的运算定律对小数、分数四则混合运算进行简便计算.
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