1
2
-
1
6
=
3
5
+
4
5
=
3
4
+
1
5
=
12-
3
8
=
1
3
4
÷1.75=
3
4
×
2
3
=
5.1÷0.01=
4
7
×5.6=
3
4
+
2
3
=
5
8
×16=
2
1
4
÷3=
1
8
+
1
12
)×48=
1÷100%= 0.1+9.9×0.1= 12×(
1
4
×
1
6
)=
0.27÷0.3=
分析:(1)(6)(8)(10)約分計算;(2)同分母分數(shù)相加,只把分子相加,分母不變;(3)(9)通分計算;(4)把整數(shù)化成分數(shù),再計算;(5)把分數(shù)化為小數(shù)計算;(7)把被除數(shù)和除數(shù)分別擴大100倍,再計算;(11)把帶分數(shù)化為假分數(shù),把除法改為乘法,約分即可;(12)(14)運用乘法分配律簡算;(13)因為100%=1.因此結(jié)果為1;(15)去掉括號,約分計算;(16)把被除數(shù)和除數(shù)都擴大10倍,再計算.
解答:解:
1
2
-
1
6
=
1
3
3
5
+
4
5
=
7
5
3
4
+
1
5
=
19
20
12-
3
8
=11
5
8
1
3
4
÷1.75=1
3
4
×
2
3
=
1
2
5.1÷0.01=510
4
7
×5.6=3.2
3
4
+
2
3
=
17
12
5
8
×16=10
2
1
4
÷3=
3
4
1
8
+
1
12
)×48=10
1÷100%=1 0.1+9.9×0.1=1.09 12×(
1
4
×
1
6
)=
1
2
0.27÷0.3=0.9
點評:此題考查了約分、通分、數(shù)字轉(zhuǎn)化以及簡便計算.
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