285﹣199{#blank#}1{#/blank#}285﹣200﹣1             

2424÷101{#blank#}2{#/blank#}2424÷202

96×30{#blank#}3{#/blank#}96×48                

2平角{#blank#}4{#/blank#}1周角．

135+{#blank#}1{#/blank#}=467+{#blank#}2{#/blank#}                运用了{#blank#}3{#/blank#}

（29×{#blank#}4{#/blank#}）×8=29×（125×{#blank#}5{#/blank#}）  运用了{#blank#}6{#/blank#}

25×67×4=25×{#blank#}7{#/blank#}×67              运用了{#blank#}8{#/blank#}

125×（400+{#blank#}9{#/blank#}） =125×400+125×8   运用了{#blank#}10{#/blank#}

72+57+43 =72+（57+43 ）            运用了{#blank#}11{#/blank#}