解:
(1)406+4480÷28,
=406+160,
=566;
(2)17
-1
-1
,
=17
-1
-1
,
=16-1
,
=14
;
(3)
÷(
-
)×5.5,
=
÷
×5.5,
=
×5.5,
=3.3;
(4)
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)5-(
+
)×30,
=5-(
×30+
×30),
=5-(2.5+2),
=5-4.5,
=0.5;
(6)[1
-(2.5-1
)]÷
,
=[1
-2.5+1
]÷
,
=[1
+1
-2.5]÷
,
=[3-2.5]÷
,
=0.5÷
,
=4.
分析:(1)先算除法,再算加法;
(2)根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)先算減法,再算除法,最后算乘法;
(4)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(5)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(6)中括號(hào)里面根據(jù)減法的性質(zhì)進(jìn)行計(jì)算,最后算除法.
點(diǎn)評(píng):此題主要考查分?jǐn)?shù)、整數(shù)、小數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.