问题 解答题
[2
3
14
+(3
1
7
-1.75)÷1.56]÷
1
28
答案

[2

3
14
+(3
1
7
-1.75)÷1.56]÷
1
28

=[2

3
14
+(3
1
7
-1
3
4
)÷1.56]÷
1
28

=(

31
14
+
39
28
÷
39
25
)÷
1
28

=(

31
14
+
39
28
×
25
39
)×28,

=(

31
14
+
25
28
)×28,

=

31
14
×28+
25
28
×28,

=62+25,

=87,

单项选择题 A1/A2型题
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