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(2008•福田区)用脱式计算:(1)(78+712-56)×96;(2)15÷[(23+15)×113].

题目详情
(2008•福田区)用脱式计算:
(1)(
7
8
+
7
12
-
5
6
)×96;                  
(2)
1
5
÷[(
2
3
+
1
5
)×
1
13
].
▼优质解答
答案和解析
(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.