15-7=( )-( )=( )-( ) ( )-( )=12-6 =( )-( ) 16-9=( )-( )=( )-
15-7=( )-( )=( )-( ) ( )-( )=12-6 =( )-( ) 16-9=( )-( )=( )-
9÷()=()/16=0.75=15/()=()/()
5+(-9)= 11-(+7)= (-12)-(+2.1)= -(-15)-(-8) (-2/3)
33/22=()/66=66/() ()/4=36/16=72/() 7/()=14/()=35/15 14/6=()/
15:20=()除以()=():()=():24=12:()=()%=()
3/4=()/16=12除()=15/()=()小数?
0.625=15:()=()除以16=()%
1、 4:()=25 ():0.75=0.8 ():16=0.25 2、 7/6*()=()*8/7=9/8*()=7/
75/()=()/40=9:()=3/()=()/16=0.75
( )+( )=( )+( )=( )+( )=( )+( )
0.75=6÷()=():12=15/()=()%
( )12+()9()=()81()