题目内容

2
5
÷4=
5
6
×4=		 7÷
14
15
=		 9×
1
16
=
8
21
÷
4
7
=
8
15
×
5
6
=
3
5
÷9÷
1
15
=
2
3
÷
2
3
×
1
3
=
分析：分数乘法：分子相乘的积做分子，分母相乘的积做分母；
分数除法：除以一个不为0的数，等于乘上这个数的倒数．
解答：解：
2
5
÷4=
1
10
5
6
×4=
10
3
 7÷
14
15
=
15
2
 9×
1
16
=
9
16
8
21
÷
4
7
=
2
3
8
15
×
5
6
=
4
9
3
5
÷9÷
1
15
=1
2
3
÷
2
3
×
1
3
=
1
3
．
点评：本题考查了基本的计算，计算时要细心，注意把结果化成最简分数．
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7.2+2.8=		 0.7×16-16×0.2= 6÷1.2=
9.2÷2.3= 24÷4+56÷4= 1.5-4.5=
30×（200+3）= 12×2.5= 2.5×0.4=
0.36+0.64= 4÷0.25= 2.63+0.37=
1.4×2.5×4= 8.4÷4.2= 4.8÷0.3=
0.96÷0.3= 8-2.5=8×1.5= 2.73+1.5×4=
1.8×5=
2.3×0.4= 7.2÷0.9= 3.2+0.25×4=
0.25×3= 4.8÷0.04= 58-17.4-12.6=
6.2×3.9≈ 3.98×0.52≈ 7.1×5.03≈
28.3÷7.08≈ 12.2÷0.4≈ 56÷7.12≈
180÷60= 12×25= 0÷90=
4×5÷4×5= 0.25×4+4= 131+218+269+182=
25×6×4= 420÷35= 36×5×4=
120÷5÷3= 198-75-25= 120-20÷5=
59亿-58亿= （1.3+3.5）÷0.6= 75÷2.5=
0.45÷1.25÷8= 2.5×7.6×4= 97.6÷0.02=
8.8-（0.25+0.4）= 0.25+87+0.75= 0.8-0.35×2=
0.1÷0.01×0.1= 9.9+9.9×99= 2.7×3.6+6.4×2.7=
720÷8÷9= 2.9+5.7+2.1= 2-0.16-0.64=
16.7+84.5-16.7= 6.8-（3.8+2.9）= 9×1.3+9×6.7=
5.5-5.25+5.2= 0.8×25-10= 42.8×25×4=
7.2+2.8= 0.9÷0.01= 3.5+7.6=
3×0.2×0.5= 0.96÷0.3= 1.5×0.4=
7÷0.25= 2.5×0.7×0.8= 8-2.5=
16÷1.6= 5.6×1.01= 8×（2.5+0.25）=
0.36+0.64= 64.32÷16= 72.8÷0.8=
8.4×0.2+1.6×0.2= 8.4÷4.2= 0.05×0.8=
2.56-0.37= 1.23×3= 25×0.8×0.5=
12×2.5= 3.2÷1.6= 3.5+3.5×3=
19.6÷2= 8.8÷2.2= 3.9+2.03=
7.2×0.3+2.8×0.3= 13.8+9.9= 2.4×2.5=
0.75×4= （1.5+0.25）×4= 4.2÷0.1=
4.2÷3.5= 2.14-0.9= 27+456+73=
12÷0.3= 2.87÷0.7= 13÷4=
24÷4+56÷4= 2.1×0.3÷2.1= 2.3-0÷8.1=
1.37-1.37÷1.37= 4.4÷（5×0.2）= 7×1.3=
0.96÷0.06= 0.36×0.3= 0.35÷0.7=
13.65÷13= 4×0.8×0.25×1.25= 13+0.7÷0.7=
7.05×23.7+7.05×76.3= 0.125×3.2×2.5= （12+23.1÷0.75）×0.4-5.12=
728+199= 637-201= 16×25=
1.6×[（12-7.2）÷（0.84÷2.1）]=
450-140= 25÷7= 900+238= 600-9×8=
90-7×5= 26+30-28= 48÷（2+4）= 780-772=
26+24= 80-30= 78-26=
5
6
-
1
2
=
(
1
2
+
1
3
+
1
4
) × 24=		 0.25×2.69×4= 10-2.87-7.13=
12
7
÷24=
3÷
4
5
=		 0.87-0.49 4.9×0.7=
4
5
÷
7
10
=
8
5
 ÷
5
8
=
7
18
÷
5
9
=
1
2
×
1
5
=		 2+
4
9
=
（25+4）×4= 12.37-3.25-6.75= 3/14×6= 0.51÷17=
14-7.4= 5.2÷1.3= 25×12=
3
16
÷
3
16
=
9
26
÷
8
13
=		 2.5-2= 36-29= 120÷4=
300+25= 630-30= 4×50= 15.9+10.8=
26×13= 24÷4+56÷4= 8-2.5= 12×2.5=
2吨50千克=
2.05
2.05
吨．

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