1
6
÷
2
3
=
3
4
÷
1
8
=
1
3
-
1
6
=
1
4
+
3
4
=
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:除以一個數(shù)(0除外),就等于乘這個數(shù)的倒數(shù);異分母分數(shù)相加減,先依據(jù)分數(shù)的基本性質(zhì)化成同分母分數(shù),再進行加減;分數(shù)乘分數(shù),把分子和分子相乘的積作分子,分母和分母相乘的積作分母,能約分的要先約分;再據(jù)分數(shù)四則混合運算的順序,即可逐題解答.
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
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.
點評:此題主要考查分數(shù)乘法和除法的運算法則,以及分數(shù)四則混合運算的順序.
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