题目内容

能简算的要简算.
1
6
+
3
4
-
2
3
)×12
23-
8
9
×
3
4
÷
1
27
8
13
÷7+
1
7
×
6
13

5÷[( 
2
3
+
1
5
)×
1
13
]
4
25
×23+
4
25
×67
1
2
-
1
6
)×
3
5
÷
1
5
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(3)(5)利用乘法分配律简算;
(2)先算乘法,再算除法,最后算减法;
(4)先算加法,再算乘法,最后算除法;
(6)先算减法,再算乘法,最后算除法.
解答: 解:(1)(
1
6
+
3
4
-
2
3
)×12
=
1
6
×12+
3
4
×12-
2
3
×12
=2+9-8
=3;

(2)23-
8
9
×
3
4
÷
1
27

=23-
2
3
×27
=23-18
=5;

(3)
8
13
÷7+
1
7
×
6
13

=
8
13
×
1
7
+
1
7
×
6
13

=(
6
13
+
8
13
)×
1
7

=
14
13
×
1
7

=
2
13


(4)5÷[(
2
3
+
1
5
)×
1
13
]
=5÷(
13
15
×
1
13

=5÷
1
15

=5×15
=75;

(5)
4
25
×23+
4
25
×67
=
4
25
×(23+67)
=
4
25
×90
=
72
5


(6)(
1
2
-
1
6
)×
3
5
÷
1
5

=(
3
6
-
1
6
)×
3
5
÷
1
5

=
1
3
×
3
5
×5
=1.
点评:混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当利用运算定律简算.
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