（250 ÷12）÷（50 ÷{#blank#}1{#/blank#}）＝5           

（250×2）÷（50 ÷2）＝{#blank#}2{#/blank#}

（250×{#blank#}3{#/blank#}）÷（50×4）＝5           

0.34×1.1{#blank#}1{#/blank#}0.34        5.5{#blank#}2{#/blank#}5.5÷0.9

4.5×0.2{#blank#}3{#/blank#}4.5÷0.2      8.75÷2.5{#blank#}4{#/blank#}87.5÷0.25

4.09×1.2{#blank#}1{#/blank#}4.09          9.84÷2{#blank#}2{#/blank#}9.84

1.6×0.37{#blank#}3{#/blank#}1.6           3.7×100+3.7{#blank#}4{#/blank#}3.7×101

2.4÷0.6{#blank#}5{#/blank#}2.4            4.9÷2.8{#blank#}6{#/blank#}4.9÷0.7