题目内容
脱式计算: 90.8+5.4÷0.27-80.9 |
| ||||||||||||
(
|
6.3×[(1.4+
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|
分析:根据小数、分数四则混合运算的运算顺序,按照小数、分数四则运算的计算法则进行简算.
解答:解:(1)90.8+5.4÷0.27-80.9,
=90.8+20-80.9,
=110.8-80.9,
=29.9;
(2)
-(
+
-
),
=
-(
+
-
),
=
-
,
=
-
,
=
,
=2
;
(3)(
+
)÷(1-
×
),
=
÷(1-
),
=
÷
,
=
×
,
=
;
(4)6.3×[(1.4+
)÷1.12-
],
=6.3×[(1
+
)÷1
-
],
=6.3×[
×
-
],
=6.3×[
-
],
=6.3×
,
=8.7;
(5)
×3÷[12×(3.75+
)].
=11÷[12×(3
+
)],
=11÷[12×
],
=11÷77,
=
,
=
.
=90.8+20-80.9,
=110.8-80.9,
=29.9;
(2)
21 |
8 |
2 |
3 |
3 |
4 |
5 |
6 |
=
21 |
8 |
8 |
12 |
9 |
12 |
10 |
12 |
=
21 |
8 |
7 |
12 |
=
63 |
24 |
14 |
24 |
=
49 |
24 |
=2
1 |
24 |
(3)(
1 |
4 |
3 |
8 |
3 |
4 |
2 |
5 |
=
5 |
8 |
3 |
10 |
=
5 |
8 |
7 |
10 |
=
5 |
8 |
10 |
7 |
=
25 |
28 |
(4)6.3×[(1.4+
1 |
3 |
1 |
6 |
=6.3×[(1
2 |
5 |
1 |
3 |
3 |
25 |
1 |
6 |
=6.3×[
26 |
15 |
25 |
28 |
1 |
6 |
=6.3×[
65 |
42 |
7 |
42 |
=6.3×
29 |
21 |
=8.7;
(5)
11 |
3 |
8 |
3 |
=11÷[12×(3
3 |
4 |
8 |
3 |
=11÷[12×
77 |
12 |
=11÷77,
=
11 |
77 |
=
1 |
7 |
点评:此题主要考查小数、分数四则混合运算,目的是使学生牢固掌握运算顺序和计算法则,能够正确迅速地进行简算.
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