0.6+0.3=       1.2-0.4=       12.5-2.5=       7.9-0.9=    

1-0.6=       8.6-7=       3.12×100=      

99+68=      0.5+0.5=      1.2-0.3=      

10-0.8=      3.39+17.61=       1-0.84-0.16=      

7.4+（5.6-4）=      3-0.5+2.5=      24.3-（8.5+5.8）=      

10－0.09=      3.8＋0.12=      0.01＋0.1=      1.5×6+1.5×4=      

9.60{#blank#}1{#/blank#}8.91      8.5+4.25{#blank#}2{#/blank#}12.75     86+47{#blank#}3{#/blank#}47+86

11.4{#blank#}4{#/blank#}15.11     10-4.3{#blank#}5{#/blank#}6.7        102×66{#blank#}6{#/blank#}100×66+2