3.72×5.4+5.4×6.28     
9
32
÷〔
3
4
-(
7
16
-
1
4
)〕
1375+450÷18×25
5
9
×
3
4
+25%×
5
9
        
20+
4
5
×
3
4
÷
1
15
       
2
5
÷〔(
8
9
-
1
6
)×
9
10
分析:(1)(4)運(yùn)用乘法分配律計(jì)算,(2)(3)(5)(6)依據(jù)四則運(yùn)算計(jì)算順序,先算第二級運(yùn)算,再算第一級運(yùn)算,如果只含有同一級運(yùn)算,按照從左到右順序計(jì)算,有括號(hào)先算括號(hào)里面的解答.
解答:解:(1)3.72×5.4+5.4×6.28,
=5.4×(3.72+6.28),
=5.4×10,
=54;

(2)
9
32
÷[
3
4
-(
7
16
-
1
4
)],
=
9
32
÷[
3
4
-
3
16
],
=
9
32
÷
9
16
,
=0.5;

(3)1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000;

(4)
5
9
×
3
4
+25%×
5
9
,
=
5
9
×(
3
4
+25%),
=
5
9
×1,
=
5
9
;
   
(5)20+
4
5
×
3
4
÷
1
15

=20+
3
5
÷
1
15
,
=20+9,
=29;
      
(6)
2
5
÷[(
8
9
-
1
6
)×
9
10
],
=
2
5
÷[
13
18
×
9
10
],
=
2
5
÷
13
20
,
=
8
13
點(diǎn)評:本題主要考查學(xué)生對于乘法分配律,以及四則運(yùn)算計(jì)算方法掌握.
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