(1)0.32×0.25×0.125
(2)1.2÷3
3
4
×
3
8

(3)
3
8
×5
1
3
÷1.2-
1
2

(4)3
1
5
÷[(1
2
3
+
1
5
)×2
1
7
]
(5)[4-(5
3
4
-3
3
8
)]×
4
39

(6)
4
25
×[
7
16
+(
13
16
-0.25÷
1
2
)].
分析:(1)把0.32看作0.4×0.8,運(yùn)用乘法交換律與結(jié)合律簡(jiǎn)算;
(2)把除法改為乘法,約分計(jì)算;
(3)把小數(shù)化為分?jǐn)?shù),先算乘除,再算減法;
(4)(5)先算小括號(hào)內(nèi)的,再算中括號(hào)內(nèi)的,最后算括號(hào)外的;
(6)把小數(shù)化為分?jǐn)?shù),先算小括號(hào)內(nèi)的除法,然后去掉小括號(hào),中括號(hào)內(nèi)的通分計(jì)算,最后算括號(hào)外的.
解答:解:(1)0.32×0.25×0.125
=0.4×0.8×0.25×0.125
=(0.4×0.25)×(0.125×0.8)
=0.1×0.1
=0.01;

(2)1.2÷3
3
4
×
3
8

=
7
5
×
4
15
×
3
8

=
7
50


(3)
3
8
×5
1
3
÷1.2-
1
2

=
3
8
×
16
3
÷
6
5
-
1
2

=
3
8
×
16
3
×
5
6
-
1
2

=
5
3
-
1
2

=
7
6
;

(4)3
1
5
÷[(1
2
3
+
1
5
)×2
1
7
]
=3
1
5
÷[
28
15
×
15
7
]
=
16
5
÷4
=
4
5
;

(5)[4-(5
3
4
-3
3
8
)]×
4
39

=[4-2
3
8
4
39

=
13
8
×
4
39

=
1
6
;

(6)
4
25
×[
7
16
+(
13
16
-0.25÷
1
2
)]
=
4
25
×[
7
16
+(
13
16
-
1
4
÷
1
2
)]
=
4
25
×[
7
16
+(
13
16
-
1
2
)]
=
4
25
×[
7
16
+
13
16
-
1
2
]
=
4
25
×
3
4

=
3
25
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,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)算律簡(jiǎn)便計(jì)算.
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