题目内容
脱式计算
(
-
)÷
+
÷
+
×
÷(
-
)
[3.2×(1-
)+
]÷
.
(
1 |
4 |
1 |
12 |
3 |
8 |
2 |
9 |
1 |
2 |
4 |
5 |
3 |
8 |
1 |
6 |
8 |
3 |
4 |
5 |
8 |
15 |
[3.2×(1-
5 |
8 |
18 |
5 |
12 |
25 |
分析:本题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,有括号的要算括号里面的.
解答:解:(
-
)÷
=
×
,
=
;
+
÷
+
=
+
+
,
=
+(
+
),
=
+1,
=1
;
×
÷(
-
)
=
÷
,
=
;
[3.2×(1-
)+
]÷
=[
×
+
]÷
,
=[
+
]×
,
=
×
,
=10.
1 |
4 |
1 |
12 |
3 |
8 |
=
1 |
6 |
8 |
3 |
=
4 |
9 |
2 |
9 |
1 |
2 |
4 |
5 |
3 |
8 |
=
2 |
9 |
5 |
8 |
3 |
8 |
=
2 |
9 |
5 |
8 |
3 |
8 |
=
2 |
9 |
=1
2 |
9 |
1 |
6 |
8 |
3 |
4 |
5 |
8 |
15 |
=
4 |
9 |
4 |
15 |
=
5 |
3 |
[3.2×(1-
5 |
8 |
18 |
5 |
12 |
25 |
=[
16 |
5 |
3 |
8 |
18 |
5 |
12 |
25 |
=[
6 |
5 |
18 |
5 |
25 |
12 |
=
24 |
5 |
25 |
12 |
=10.
点评:完成此类有关于分数的四则混合运算时要细心,注意通分约分.
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