分析:(1)先算小括號(hào)里的除法算式和乘法算式,再去括號(hào)里計(jì)算即可;
(2)先算小括號(hào)里的加法,再算中括號(hào)里的乘法,最后算括號(hào)外的除法;
(3)先求出除法算式和乘法算式,再運(yùn)用減法的性質(zhì)進(jìn)行簡算;
(4)先求出乘法算式和除法算式,再算加法;
(5)先算小括號(hào)里的乘法,再算小括號(hào)里的減法,最后算括號(hào)外的減法;
(6)先算小括號(hào)里的減法,再算中括號(hào)里的乘法,再算中括號(hào)里的加法,最后算括號(hào)外的乘法.
解答:解:(1)5
-(1
÷4+
×1),
=5
-(
+
),
═5
-
-
,
=5-
,
=4
;
(2)10
÷[(3.5+2.8)×
],
=10
÷[6.3×
],
=10
÷0.9,
=
;
(3)3
÷-÷3-
×3,
=
-
-
,
=
-(
+
),
=
-
,
=
;
(4)
×3.2+2.8÷2
,
=0.8+
,
=
;
(5)4-(10.9-5
×
1),
=4-(10.9-7.2),
=4-3.7,
=0.3;
(6)7.8×[32×
(1-)+3.6],
=7.8×[32×
+3.6],
=7.8×[12+3.6],
=7.8×15.6,
=121.68.
點(diǎn)評(píng):此題考查了整數(shù)、分?jǐn)?shù)、小數(shù)四則混合運(yùn)算的順序,注意運(yùn)算符號(hào),細(xì)心計(jì)算即可.