因为 ，（a和b都是自然数的）所以a>b.

0.89×0.12○0.89        4.05×1.01○4.05×0.99     6.7×0.98○6.7

6.09×1.3○6.09        5.15×3.3○51.5×0.33      18×0.35○0.35

6.3×2.04○2.04         4.8×7.5○7.5×4.8         3.9×1○1

4.5×2.1={#blank#}1{#/blank#}     45×{#blank#}2{#/blank#}=0.945     {#blank#}3{#/blank#}×2.1=0.0945

3.28×0.9{#blank#}1{#/blank#}3.28      3.28×1.005{#blank#}2{#/blank#}3.28        32.8×0.1{#blank#}3{#/blank#}3.28

4.5{#blank#}4{#/blank#}45×0.1          4.5×0.5{#blank#}5{#/blank#}4.5             4.5×1.3{#blank#}6{#/blank#}4.5

3.5×1.02{#blank#}1{#/blank#}3.5                     8.7÷0.99{#blank#}2{#/blank#}8.7

5.45÷0.13{#blank#}3{#/blank#}54.5÷1.3          0.9×0.78{#blank#}4{#/blank#}0.78÷0.9