40÷()=80÷()=()÷20=240÷()=160÷()=560÷()=()÷8=12
240÷()=160÷()=560÷()=()÷8=40×()=80÷()=()×20
120×2÷(80-60),=240÷20,=12(分钟);(
-20÷(-5)-(-56)÷8=( )
12 ÷( )= 6 /( )= ( )/ 5 = 0.6 = ( )÷ 8 = ( )%
11、( )÷[( )÷4-0.75]÷0.03125=
5.6÷0.05=( )÷5
3/8=( )÷16=12÷( )=()%=() 小数
40÷()=():20=0.8=()%
12÷(3/4÷1/5) = =
3÷4=():24=12÷()=36÷()=3+6÷4+()=3+()÷4+24
():20=12/()=24÷()=()%
3÷()=24,3÷()=0.8