问题 解答题
用脱式计算:
(1)(
7
8
+
7
12
-
5
6
)×96;
(2)
1
5
÷[(
2
3
+
1
5
)×
1
13
].
答案

(1)(

7
8
+
7
12
-
5
6
)×96,

=

7
8
×96+
7
12
×96-
5
6
×96

=12×7+8×7-5×16,

=(12+8)×7-5×16,

=140-80,

=60;

(2)

1
5
÷[(
2
3
+
1
5
)×
1
13
],

=

1
5
÷[(
10
15
+
3
15
1
13
],

=

1
5
÷(
13
15
×
1
13
),

=

1
5
÷
1
15

=3.

单项选择题
单项选择题