分析:(1)根據(jù)連減的性質(zhì)進行簡算;
(2)根據(jù)加法交換律進行簡算;
(3)根據(jù)加法交換律和結(jié)合律進行簡算;
(4)根據(jù)連減的性質(zhì)進行簡算;
(5)根據(jù)加法交換律和結(jié)合律進行簡算;
(6)先算加法,再算減法;
(7)先算減法,再算除法;
(8)先算減法,再算乘法,最后算除法;
(9)根據(jù)乘法分配律進行計算;
(10)先算加法,再算除法;
(11)根據(jù)乘法交換律和結(jié)合律進行簡算.
解答:解:
(1)1+
-(
+),
=1+
-
-
,
=(1-
)+(
-
),
=
;
(2)
-+,
=
+
-
,
=1-
,
=
;
(3)
+++,
=(
+
)+(
+
),
=1+1,
=2;
(4)
--,
=
-(
+
),
=
-
,
=
;
(5)5+
++,
=(5+
)+(
+
),
=5
+1,
=6
;
(6)24-(
+),
=24-
,
=22
;
(7)(
-)÷
,
=
÷
,
=
;
(8)
÷[
×(1-
)],
=
÷[
×
],
=
÷
,
=6;
(9)5×(
+
),
=5×
+5×
,
=
+
,
=
;
(10)(
+)÷
,
=
÷
,
=
;
(11)4×48×25×
,
=(4×25)×(48×
),
=100×8,
=800.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學的運算律簡便計算.