问题 解答题
计算下面各题:
(1)
15
16
+(
7
16
-0.25)÷
1
2

(2)
7
10
÷[4-(3.2×
5
8
+
4
5
)]
答案

(1)

15
16
+(
7
16
-0.25)÷
1
2

=

15
16
+(
7
16
-
4
16
)×2,

=

15
16
+
3
16
×2,

=

15
16
+
6
16

=

21
16

(2)

7
10
÷[4-(3.2×
5
8
+
4
5
)].

=

7
10
÷[4-(2+0.8)],

=

7
10
÷[4-2.8],

=

7
10
÷
6
5

=

7
12

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