题目内容

神机妙算细又巧:
(54+
9
13
)÷9
36÷[(
5
6
-
1
3
)×3]
2-
6
13
÷
9
26
-
2
3
[
3
5
-(
3
4
-
2
5
)]÷4
7
8
÷5+
7
8
÷2
5
8
+
1
27
)×8+
19
27
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)先算除法,再根据连减的性质进行计算;
(4)根据连减的性质进行计算中括号里面的,最后算除法;
(5)根据乘法分配律进行计算;
(6)根据乘法分配律进行计算.
解答:解:(1)(54+
9
13
)÷9,
=(54+
9
13
)×
1
9

=54×
1
9
+
9
13
×
1
9

=6+
1
13

=6
1
13


(2)36÷[(
5
6
-
1
3
)×3],
=36÷[(
5
6
×3-
1
3
×3],
=36÷[2.5-1],
=36÷1.5,
=24;

(3)2-
6
13
÷
9
26
-
2
3

=2-
4
3
-
2
3

=2-(
4
3
+
2
3
),
=2-2,
=0;

(4)[
3
5
-(
3
4
-
2
5
)]÷4,
=[
3
5
-
3
4
+
2
5
]÷4,
=[
3
5
+
2
5
-
3
4
]÷4,
=[1-
3
4
]÷4,
=
1
4
÷4,
=
1
16


(5)
7
8
÷5+
7
8
÷2,
=
7
8
×
1
5
+
7
8
×
1
2

=
7
8
×(
1
5
+
1
2
),
=
7
8
×
7
10

=
49
80


(6)(
5
8
+
1
27
)×8+
19
27

=
5
8
×8+
1
27
×8+
19
27

=5+
8
27
+
19
27

=5+(
8
27
+
19
27
),
=5+1,
=6.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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