问题 解答题
(2
2
9
×
4
25
+0.84×2
2
9
)÷[4.375-(2
3
8
+1
7
12
)]
答案

(2

2
9
×
4
25
+0.84×2
2
9
)÷[4.375-(2
3
8
+1
7
12
)]

=(

4
25
+0.84)×2
2
9
÷[4.375-(2
3
8
+1
7
12
)],

=1×2

2
9
÷[4.375-(2.375+1
7
12
)],

=2

2
9
÷[4-1
7
12
],

=2

2
9
÷2
5
12

=1

1
87

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