(1)0.720,0.702,0.712
0.702
0.702
0.712
0.712
0.720
0.720

(2)8.09,8.91,9.08,9.78
8.09
8.09
8.91
8.91
9.08
9.08
9.78
9.78

(3)3.87、4.53、3.45、3.78、4.35
3.45
3.45
3.78
3.78
3.87
3.87
4.35
4.35
4.53
4.53
分析:比較兩個小數(shù)的大小,先看它們的整數(shù)部分,整數(shù)大的那個數(shù)就大;如果整數(shù)部分相同,十分位大的那個數(shù)就大.如果十分位上的那個數(shù)也相同,百分位上的數(shù)大的那個數(shù)就大,依此類推.
解答:解:(1)0.720,0.702,0.712,
0.702<0.712<0.720;
(2)8.09,8.91,9.08,9.78,
8.09<8.91<9.08<9.78;
(3)3.87、4.53、3.45、3.78、4.53,
3.45<3.78<3.87<4.35<4.53;
故答案為:(1)0.702<0.712<0.720,
(2)8.09<8.91<9.08<9.78,
(3)3.45<3.78<3.87<4.35<4.53.
點評:掌握小數(shù)大小比較的方法,是解答此題的關鍵.
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