分析:(1)先把小括號(hào)里面的計(jì)算運(yùn)用乘法分配律簡(jiǎn)算,再算中括號(hào)里面的除法,最后算括號(hào)外的減法;
(2)先把小括號(hào)里面的計(jì)算運(yùn)用乘法分配律簡(jiǎn)算,再算括號(hào)外的除法;
(3)先算小括號(hào)里面的加法,再算括號(hào)外的除法,最后算括號(hào)外的加法;
(4)先算小括號(hào)里面的加法,再算中括號(hào)里面的乘法,最后算括號(hào)外的除法.
解答:解:(1)2184-[(44×19+44)÷5],
=2184-[(19+1)×44÷5],
=2184-[20×44÷5],
=2184-[880÷5],
=2184-176,
=2008;
(2)(2.5-2.5×0.6)÷0.25,
=[2.5×(1-0.6)]÷0.25,
=[2.5×0.4]÷0.25,
=1÷0.25,
=4;
(3)
(+)÷+,
=
×
+,
=
+
,
=
;
(4)
÷[(+)×],
=
÷[
×
],
=
÷,
=3.
點(diǎn)評(píng):1.一個(gè)算式里,如果含有兩級(jí)運(yùn)算,要先做第二級(jí)運(yùn)算,后做第一級(jí)運(yùn)算.
2.一個(gè)算式里,如果有括號(hào),要先算小括號(hào)里的,再算中括號(hào)里面的.