题目内容

1
6
÷
2
3
=
3
4
÷
1
8
=
1
3
-
1
6
=
1
4
+
3
4
=
1÷
3
4
=
1
5
×
1
9
=
4
5
×
3
4
=
2
3
×
9
4
=
2
5
-
1
5
=
2
9
+
5
9
=		 10.1-0.89= 423-198=
0.68+0.42= 8.1-5.1= 0.081×10= 75÷10=
0.96÷0.8= 1-0.08= 3.5×0.01= 1.25÷0.25=．
分析：除以一个数（0除外），就等于乘这个数的倒数；异分母分数相加减，先依据分数的基本性质化成同分母分数，再进行加减；分数乘分数，把分子和分子相乘的积作分子，分母和分母相乘的积作分母，能约分的要先约分；再据分数四则混合运算的顺序，即可逐题解答．
解答：解：
1
6
÷
2
3
=
1
4
3
4
÷
1
8
=6
1
3
-
1
6
=
1
6
1
4
+
3
4
=1
1÷
3
4
=1
1
3
1
5
×
1
9
=
1
45
4
5
×
3
4
=
3
5
2
3
×
9
4
=1
1
2
2
5
-
1
5
=
1
5
2
9
+
5
9
=
7
9
 10.1-0.89=9.21 423-198=225
0.68+0.42=1.1 8.1-5.1=3 0.081×10=0.81 75÷10=7.5
0.96÷0.8=1.2 1-0.08=0.92 3.5×0.01=0.035 1.25÷0.25=5．
点评：此题主要考查分数乘法和除法的运算法则，以及分数四则混合运算的顺序．
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相关题目
直接写得数．
1
2
-
1
8
=
1
2
-
1
3
=		 2+
4
9
=		 3-
2
3
=
5
9
+
1
3
=
4
5
-
1
2
=
1
6
+
2
3
=
3
4
-
5
8
=
1
6
×
3
5
=
3
5
÷
9
10
=		 14×
5
28
=
3
4
×
1
4
÷3=
1
6
×2=
8
9
÷4=
1
2
÷
1
3
=
4
5
×
1
6
=
1
2
÷
5
6
=
1
4
÷
2
7
=
1
2
×
4
3
=
1
2
÷
1
6
=
2
3
×
3
4
=		 10÷
5
7
=
1
4
×8=
5
6
÷
2
3
=
3
4
×
2
3
=
4
5
×
2
3
=
解方程或比例．
X：2=0.15：0.6            		 X-
1
5
X=30%           
2
3
：X=
1
6
：
3
4
7×5
5
14
=
5
8
÷
2
3
=
1
6
+
2
5
=
2
3
×
3
4
=		 1+
1
2
-0.4=
1
4
+0.75=
1
3
+
2
9
=
6
7
÷9=
1
4
+
1
2
=
5
6
×0.4=		 4÷
8
9
=
1
9
×
1
9
=
（2+
2
5
）×（1+
1
4
）=
2
3
×9=
6
9
+
1
6
=
4÷
1
3
=
1
2
+1
1
3
=		 5-（2+
3
8
）=
4.5÷
1
4
=		 39×
4
13
=		 11×（10+
1
11
）=
11+（3+
2
3
）=
3
5
×
5
6
=		 8×
3
4
=
12-（6+
3
4
）=		 1÷（1+
3
4
）=		 20÷20%=
1÷0.01= 1.12= 9.9÷（1+
4
5
）=
81÷
5
9
=		 1.65-0÷1.65=
2
3
×
4
9
×
1
2
=
5-1.4-1.6= （0.18+0.9）÷9= 8×
3
10
×1.25=
1.25×0.16×8=
5
8
+7.3÷10%=
5
8
+9-0.2=
5.08-0.74-1.26=
1
4
×0.2=		 1-.0375÷
5
8
=
8÷0.5+
1
4
×（1+
1
4
）=		 （
1
12
+
5
6
）×24=		 10（3+
1
7
）÷（3+
1
7
）=
（3+
1
2
+5+
1
3
+2+
1
2
）-（5+
1
3
）=
2
5
+
1
5
÷
2
5
+
1
5
=		 1-
3
10
-
2
5
=
3-（2+
4
9
）+（2+
4
9
）=
3
8
-
3
8
÷3=		 0×（3+
2
9
）+（1+
2
5
）=
1
6
+
1
7
-
1
6
+
1
7
=		 0.125×64×0.125=
5
4
×8+8×
1
4
=
3
8
+
3
4
×16=
5
9
-
5
6
+
4
9
=

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