0.8×1.1
=
=
1.1×0.8      
2.85×0.6
2.85÷0.6    
 
5
9
4
9
    
 
5
8
7
10
分析:0.8×1.1與1.1×0.8比較,根據(jù)乘法交換律直接判斷即可;
一個(gè)數(shù)(0除外)乘一個(gè)小于1的數(shù),結(jié)果小于原數(shù);一個(gè)數(shù)(0除外)除以一個(gè)小于1的數(shù)(0除外),結(jié)果大于原數(shù);據(jù)此判斷2.85×0.6 與2.85÷0.6的大;
同分母的分?jǐn)?shù)比較,分子大的就大,異分母的分?jǐn)?shù)比較,通分化成同分母的分?jǐn)?shù)再比較;據(jù)此判斷后兩題即可.
解答:解:
0.8×1.1=1.1×0.8       2.85×0.6<2.85÷0.6    
 
5
9
4
9
    
 
5
8
7
10
故答案為:=,<,>,<.
點(diǎn)評(píng):此題考查了積、商的變化規(guī)律及分?jǐn)?shù)大小比較方法的靈活運(yùn)用.
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