1.2+0.3 ={#blank#}1{#/blank#}       5.4-2.3={#blank#}2{#/blank#}       0.65+0.35 ={#blank#}3{#/blank#}    1-0.09 ={#blank#}4{#/blank#}

6.85+1.05 ={#blank#}5{#/blank#}   4.89-2.7 = {#blank#}6{#/blank#}   10-9.9 ={#blank#}7{#/blank#}          3.27+0.73={#blank#}8{#/blank#}

4.2-4 ={#blank#}9{#/blank#}           5.1-2.1 ={#blank#}10{#/blank#}      4.3 +2.7 ={#blank#}11{#/blank#}       5+ 4.4 ={#blank#}12{#/blank#}

①106.42-48.73={#blank#}1{#/blank#}

②57.69+48.73={#blank#}2{#/blank#}