分析:(1)先去掉括號,再運用加法交換律簡算;括號外是減法,去括號時注意把括號內的運算符號改變;
(2)先把34分解成33+1,然后運用乘法分配律簡算,再運用乘法結合律簡算;
(3)先把除法變成乘法,再運用乘法交換律交換,乘法分配律簡算;
(4)運用加結合律以及連續(xù)減去兩個數等于減去這兩個數的和簡算;
(5)運用乘法分配律簡算;
(6)先把除法變成乘法,再運用乘法分配律簡算.
解答:解:(1)14.5-(8.3-5.5),
=14.5-8.3+5.5,
=14.5+5.5-8.3,
=20-8.3,
=11.7;
(2)34×
+
,
=(33+1)×
+
,
=33×
+
+
,
=32+(
+
),
=32+1,
=33;
(3)56×(
-
)÷
,
=(56×10)×(
-
),
=560×(
-
),
=560×
-560×
,
=800-700,
=100;
(4)3.8-1.9+7.2-8.1,
=(3.8+7.2)-(1.9+8.1),
=11-10,
=1;
(5)(
+
-
)×24,
=
×24+
×24-
×24,
=8+52-10,
=60-10,
=50;
(6)
÷9+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
點評:此題是考查四則混合運算,要仔細觀察算式的特點,靈活運用一些定律進行簡便計算.