12.1×20.2 10.3×5.2 9.1×3.2 3.4×1.6 1.2×0.4 0.4×0.7
分析:把每一个式子进行计算,根据得数的大小再进行排列即可.
解答:1.2×0.4=0.48,
9.1×3.2=29.12,
0.4×0.7=0.28,
12.1×20.2=244.42,
3.4×1.6=5.44,
10.3×5.2=53.56,
即,12.1×20.2>10.3×5.2>9.1×3.2>3.4×1.6>1.2×0.4>0.4×0.7.
故答案为:12.1×20.2>10.3×5.2>9.1×3.2>3.4×1.6>1.2×0.4>0.4×0.7.
点评:本题运用小数的乘法的计算法则进行解答即可.