题目内容

脱式计算:
3.6-3.6÷0.9×0.8     
51
4
÷
4
3
+87.25×
3
4
    
22
9
+
1
3
)×(
23
6
-
53
16

7.8÷[32×(1-
5
8
)+3.6]
(4.2+
9
4
)÷[(21.74-
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.
解答:解:(1)3.6-3.6÷0.9×0.8
=3.6-4×0.8,
=3.6-3.2,
=0.4;

(2)
51
4
÷
4
3
+87.25×
3
4

=12.75×
3
4
+87.25×
3
4

=(12.75+87.25)×
3
4

=100×
3
4

=75;

(3)7.8÷[32×(1-
5
8
)+3.6]
=7.8÷[32×
3
8
+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5;

(4)(4.2+
9
4
)÷[(21.74-
6
25
)×
2
3
]
=(
21
5
+
9
4
)÷[(21.74-0.24)×
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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