分析:(1)根據(jù)乘法分配原則進(jìn)行乘法運(yùn)算,去掉小括號(hào),然后進(jìn)行加減法運(yùn)算即可,(2)首先把小數(shù)寫成分?jǐn)?shù)的形式,然后通分,進(jìn)行加法運(yùn)算即可,(3)首先對(duì)小括號(hào)內(nèi)的運(yùn)算進(jìn)行計(jì)算,把小括號(hào)去掉,進(jìn)行除法運(yùn)算,然后進(jìn)行加法運(yùn)算,最后把中括號(hào)去掉,進(jìn)行減法運(yùn)算即可,(4)首先進(jìn)行乘方運(yùn)算,然后進(jìn)行乘法和除法運(yùn)算,最后進(jìn)行加法運(yùn)算即可.
解答:解:(1)原式=[
-•(-48)]+[
•(-48)]-[1•(-48)]
=8-36+48
=20,
(2)原式=8+(-
)-5-
=3-
=
,
(3)原式=-8-[-7+(1-
)×
(-)]
=-8-[-7+
×
(-)]
=-8-[-7-
]
=-8+7
=-
,
(4)原式=1×2+(-8)÷4
=2-2
=0.
點(diǎn)評(píng):本題主要考查有理數(shù)的混合運(yùn)算、乘方運(yùn)算、分?jǐn)?shù)的通分等知識(shí)點(diǎn),關(guān)鍵在于正確的去括號(hào),認(rèn)真的進(jìn)行計(jì)算.