题目内容
脱式计算:
3.6-3.6÷0.9×0.8
÷
+87.25×
(
+
)×(
-
)
7.8÷[32×(1-
)+3.6]
(4.2+
)÷[(21.74-
)×
].
3.6-3.6÷0.9×0.8
51 |
4 |
4 |
3 |
3 |
4 |
(
22 |
9 |
1 |
3 |
23 |
6 |
53 |
16 |
7.8÷[32×(1-
5 |
8 |
(4.2+
9 |
4 |
6 |
25 |
2 |
3 |
分析:(1)(3)(4)根据四则混合运算的运算顺序计算即可;
(2)可根据乘法分配律计算.
(2)可根据乘法分配律计算.
解答:解:(1)3.6-3.6÷0.9×0.8
=3.6-4×0.8,
=3.6-3.2,
=0.4;
(2)
÷
+87.25×
=12.75×
+87.25×
,
=(12.75+87.25)×
,
=100×
,
=75;
(3)7.8÷[32×(1-
)+3.6]
=7.8÷[32×
+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5;
(4)(4.2+
)÷[(21.74-
)×
]
=(
+
)÷[(21.74-0.24)×
],
=
÷[
×
],
=
×
,
=
.
=3.6-4×0.8,
=3.6-3.2,
=0.4;
(2)
51 |
4 |
4 |
3 |
3 |
4 |
=12.75×
3 |
4 |
3 |
4 |
=(12.75+87.25)×
3 |
4 |
=100×
3 |
4 |
=75;
(3)7.8÷[32×(1-
5 |
8 |
=7.8÷[32×
3 |
8 |
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5;
(4)(4.2+
9 |
4 |
6 |
25 |
2 |
3 |
=(
21 |
5 |
9 |
4 |
2 |
3 |
=
129 |
20 |
43 |
2 |
2 |
3 |
=
129 |
20 |
3 |
43 |
=
9 |
20 |
点评:完成脱式计算题目时要注意计算过程的完整性,中间不要有太大跳跃.
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