题目内容

口算.
7.6+2
1
5
=
0.875-
5
8
=
6.8×0.1= 3.6÷1.2=
 1.5÷
5
13
=
3
4
×2.4=
12
7
÷
6
7
=
0.35+9
13
20
=
 9×300%= 1.69÷1.3= 12.5×88= 10.7×10=
 2.3×102= 5-1
4
9
=
0.5+
1
8
=
2
3
÷
2
3
=
1
5
6
×10=
5
18
÷1
2
3
=
1
2
5
÷14%=
1
8
=
8π= 122= ( 
1
2
3=
2×π×6=
3.14×(102-82)= 40×99= 1
1
4
×101=
1÷25%=
 16×62.5%=  3.6÷1
2
7
=
5÷5×
1
5
=
 2+2÷5=
7
10
÷
7
10
=
5
6
+
1
6
×2=
125×27×8= 015:4.5=
6:1
5
7
=
1
1
8
:2.5=
1
2
-
1
6
)×30=
 6×
1
5
×6÷
1
5
=
分析:直接利用小数分数四则运算的方法和混合运算的顺序直接计算出结果即可;注意适当运用运算定律简算.比的算式利用求比值的方法求出即可.
解答:
解:
7.6+2
1
5
=9.8

0.875-
5
8
=0.25

6.8×0.1=0.68

3.6÷1.2=3
 1.5÷
5
13
=3.9
3
4
×2.4=1.8
12
7
÷
6
7
=2
0.35+9
13
20
=10
 9×300%=27 1.69÷1.3=1.3 12.5×88=1100 10.7×10=107
 2.3×102=234.6 5-1
4
9
=3
5
9
0.5+
1
8
=0.625
2
3
÷
2
3
=1
1
5
6
×10=
55
3
5
18
÷1
2
3
=
1
6
1
2
5
÷14%=10
1
8
=8a
8π=25.12 122=144 ( 
1
2
3=
1
8
2×π×6=37.68
3.14×(102-82)=113.04 40×99=3960 1
1
4
×101=126.25
1÷25%=4
 16×62.5%=10  3.6÷1
2
7
=2.8
5÷5×
1
5
=
1
5
 2+2÷5=2.4
7
10
÷
7
10
=1
5
6
+
1
6
×2=
7
6
125×27×8=27000 0.15:4.5=
1
30
6:1
5
7
=3.5
1
1
8
:2.5=0.45
1
2
-
1
6
)×30=10
 6×
1
5
×6÷
1
5
=36
点评:此题综合考查了小数、分数的四则运算以及混合运算,求比值等知识,属于基础计算题.
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