题目内容
(2012?安县模拟)脱式计算.
(1)
×
-
÷
(2)1.5÷[1.2-(0.4+0.5)]
(3)(3.75-
×
)÷
(4)[
÷(4-
)]×25.
(1)
20 |
3 |
7 |
5 |
25 |
8 |
5 |
4 |
(2)1.5÷[1.2-(0.4+0.5)]
(3)(3.75-
8 |
15 |
9 |
2 |
27 |
20 |
(4)[
9 |
10 |
7 |
4 |
分析:本组题目按照四则混合运算的顺序进行计算,即先计算乘除再计算加减,有括号的先算括号内部的.
解答:(1)
×
-
÷
,
=
×
-
×
,
=
-
,
=
-
,
=
,
=6
;
(2)1.5÷[1.2-(0.4+0.5)],
=1.5÷[1.2-0.9],
=1.5÷0.3,
=5;
(3)(3.75-
×
)÷
,
=(
-
)×
,
=(
-
)×
,
=
×
,
=1;
(4)[
÷(4-
)]×27,
=[
÷(
-
)]×27,
=[
÷
]×27,
=
×
×27,
=
,
=10
.
20 |
3 |
7 |
5 |
25 |
8 |
5 |
4 |
=
20 |
3 |
7 |
5 |
25 |
8 |
4 |
5 |
=
28 |
3 |
5 |
2 |
=
56 |
6 |
15 |
6 |
=
41 |
6 |
=6
5 |
6 |
(2)1.5÷[1.2-(0.4+0.5)],
=1.5÷[1.2-0.9],
=1.5÷0.3,
=5;
(3)(3.75-
8 |
15 |
9 |
2 |
27 |
20 |
=(
15 |
4 |
12 |
5 |
20 |
27 |
=(
75 |
20 |
48 |
20 |
20 |
27 |
=
27 |
20 |
20 |
27 |
=1;
(4)[
9 |
10 |
7 |
4 |
=[
9 |
10 |
16 |
4 |
7 |
4 |
=[
9 |
10 |
9 |
4 |
=
9 |
10 |
4 |
9 |
=
54 |
5 |
=10
4 |
5 |
点评:本题考查分数的四则混合运算的顺序及计算能力.
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