642÷6= 0.9×99+0.9= 1.25×80= 2.5÷0.01=
÷ = 2﹣ ﹣ = 3﹣ ﹣ = ( ÷ )×30=
5 6 1 0
1÷0.25= 15×60= 72×25%=
1.1-0.01= 12÷ =
24×( )=