①3.2×0.8 ② 0.98×0.5 ③48×0.35

    (  {#blank#}1{#/blank#}  )×(   {#blank#}2{#/blank#} )=2400    (  {#blank#}3{#/blank#}  )×(  {#blank#}4{#/blank#}  )=1600

    (   {#blank#}5{#/blank#} )×(  {#blank#}6{#/blank#}  )=2400    (  {#blank#}7{#/blank#}  )×(  {#blank#}8{#/blank#}  )=1600

    (   {#blank#}9{#/blank#} )×(  {#blank#}10{#/blank#}  )=2400    (   {#blank#}11{#/blank#} )×(  {#blank#}12{#/blank#}  )=1600

(  {#blank#}13{#/blank#} )×(  {#blank#}14{#/blank#}  )=2400    (  {#blank#}15{#/blank#}  )×(  {#blank#}16{#/blank#}  )=1600

1.8×2{#blank#}1{#/blank#}2    1.8×0.2{#blank#}2{#/blank#}1.8

2.1÷2=        3.8+1.02=      7.5×0.4=         2x-0.7x=

3.2×0.5=     9.6÷0.06=     3.57÷0.7=        4.5+0.76=  

3.6×2.9＝{#blank#}1{#/blank#}       0.36×2.9＝{#blank#}2{#/blank#}      1.044÷2.9＝{#blank#}3{#/blank#}