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(1)1÷0.8= (2)
3
20
÷75%=
(3)
4
5
×8÷
4
5
=
(4)
3
4
-
7
12
=
(5)
7
20
+(8
1
4
-6
3
5
)÷2
3
4
=
(6)( 
1
5
+
1
3
-
1
6
)×30=
(7)[
7
10
-(
1
2
+
2
5
×50%)]÷
16
7
=
(8)16
3
7
-(2
2
5
+3
3
7
)=
(9)10÷[
8
3
-(
5
13
÷
5
26
+
2
5
)]=
(10)
3
5
×(
1
7
+
8
21
÷
2
3
)=
分析:(1)根据小数除法的计算方法进行计算;
(2)根据分数除法的计算方法进行计算;
(3)根据乘法交换律进行计算;
(4)先通分,再计算;
(5)先算减法,再算除法,最后算加法;
(6)根据乘法分配律进行计算;
(7)先算乘法,再算加法,再算减法,最后算除法;
(8)根据连减的性质进行计算;
(9)先算小括号里面的除法,再算加法,再算减法.最后算括号外面的除法;
(10)先算除法,再算加法,最后算乘法.
解答:解:
(1)1÷0.8=1.25;

(2)
3
20
÷75%=
1
5


(3)
4
5
×8÷
4
5

=
4
5
÷
4
5
×8,
=1×8,
=8;

(4)
3
4
-
7
12

=
9
12
-
7
12

=
1
6


(5)
7
20
+(8
1
4
-6
3
5
)÷2
3
4

=
7
20
+1
13
20
÷2
3
4

=
7
20
+
3
5

=
19
20


(6)(
1
5
+
1
3
-
1
6
)×30,
=
1
5
×30+
1
3
×30-
1
6
×30,
=6+10-5,
=16-5,
=11;

(7)[
7
10
-(
1
2
+
2
5
×50%)]÷
16
7

=[
7
10
-(
1
2
+
1
5
)]÷
16
7

=[
7
10
-
7
10
16
7

=0÷
16
7

=0;

(8)16
3
7
-(2
2
5
+3
3
7
),
=16
3
7
-2
2
5
-3
3
7

=16
3
7
-3
3
7
-2
2
5

=13-2
2
5

=10
3
5


(9)10÷[
8
3
-(
5
13
÷
5
26
+
2
5
)],
=10÷[
8
3
-(2+
2
5
)],
=10÷[
8
3
-2
2
5
],
=10÷
4
15

=
75
2


(10)
3
5
×(
1
7
+
8
21
÷
2
3
),
=
3
5
×(
1
7
+
4
7
),
=
3
5
×
5
7

=
3
7
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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0.56÷0.04=1.44÷2=24.6÷0.6=4.5÷0.15=
0.63÷0.09=12.84÷1.2=3.9÷0.13=1.6÷1.6=
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0.42×0.5=0.76+1.24=3.06-0.72=0.51÷17=
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