0.25×7.6+2.4×0.25 ( 
3
4
-
1
2
-
1
6
)×24
15÷[(
2
3
+
1
5
)×
1
13
]
13
5
11
-3
4
7
-2
3
7
+2
6
11
5
8
×2
2
3
+2
1
3
÷1
1
3
13
7
8
×
1
16
+6
1
8
÷16.
分析:(1)(2)運用乘法分配律簡算;
(3)先算小括號里面的加法,再算中括號里面的乘法,最后算括號外的除法;
(4)運用加法結(jié)合律,以及連續(xù)減去兩個數(shù)等于減去這兩個數(shù)的和簡算;
(5)同時運算乘法和除法,最后算加法;
(6)先把除法變成乘法,再運用乘法分配律簡算.
解答:解:(1)0.25×7.6+2.4×0.25,
=0.25×(7.6+2.4),
=0.25×10,
=2.5;

(2)(
3
4
-
1
2
-
1
6
)×24,
=
3
4
×24-
1
2
×24-
1
6
×24,
=18-12-4,
=6-4,
=2;

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

=225;

(4)13
5
11
-3
4
7
-2
3
7
+2
6
11

=(13
5
11
+2
6
11
)-(3
4
7
+2
3
7
),
=16-6,
=10;

(5)
5
8
×2
2
3
+2
1
3
÷1
1
3
,
=
5
3
+
7
4

=
41
12
;

(6)13
7
8
×
1
16
+6
1
8
÷16,
=13
7
8
×
1
16
+6
1
8
×
1
16
,
=(13
7
8
+6
1
8
)×
1
16
,
=20×
1
16

=
5
4
點評:本題考查了四則混合運算,注意運算順序和運算法則,靈活運用所學(xué)的運算定律進行簡便計算.
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