题目内容

脱式计算(用自己喜欢的方法计算)
(1)3-
7
12
-
5
12
(2)
5
7
×
3
8
+
5
8
×
5
7
(3)
8
15
×
5
16
+
5
27
÷
10
9
(4)18×(
4
9
+
5
6
(5)
2
3
×7+
2
3
×5
(6)(
1
6
-
1
12
)×24-
4
5
分析:(1)根据减法的性质简算;
(2)(4)(5)(6)运用乘法分配律简算;
(3)同时运算乘法和除法,再算加法.
解答:解:(1)3-
7
12
-
5
12

=3-(
7
12
+
5
12
),
=3-1,
=2;

(2)
5
7
×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8
),
=
5
7
×1,
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6
),
=18×
4
9
+18×
5
6

=8+15,
=23;

(5)
2
3
×7+
2
3
×5,
=
2
3
×(7+5),
=
2
3
×12,
=8;

(6)(
1
6
-
1
12
)×24-
4
5

=
1
6
×24-
1
12
×24-
4
5

=4-2-
4
5

=2-
4
5

=1
1
5
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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