分析:(1)先把分?jǐn)?shù)化成小數(shù),然后再運(yùn)用加法結(jié)合律簡(jiǎn)算;
(2)同時(shí)運(yùn)算乘法和除法,再算加法,最后算減法;
(3)同時(shí)運(yùn)算兩個(gè)小括號(hào)里面的減法和加法,最后算括號(hào)外的除法;
(4)先算乘法,再算除法,最后算減法;
(5)先算小括號(hào)里面的除法,再算小括號(hào)里面的加法,最后算括號(hào)外的乘法;
(6)先算小括號(hào)里面的乘法,再算小括號(hào)里面的減法,然后算中括號(hào)里面的除法,最后算括號(hào)外的乘法.
解答:解:(1)0.44+
+
+0.6,
=0.44+0.4+0.56+0.6,
=(0.44+0.56)+(0.4+0.6),
=1+1,
=2;
(2)
+2
×2
-2
÷
,
=
+
-3,
=5-3,
=2;
(3)(4
-2
)÷(1
+2.4),
=2
÷3
,
=
×
,
=
;
(4)48200-156×720÷39,
=48200-112320÷39,
=48200-2880,
=45320;
(5)(3.06÷0.25+2.76)×0.2,
=(12.24+2.76)×0.2,
=15×0.2,
=3;
(6)[3
÷(3-2.4×
)]×0.2,
=[3
÷(3-
)]×0.2,
=[3
÷
]×0.2,
=
×
,
=
.
點(diǎn)評(píng):本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.