8.05L=mL
3.2m3=dm3=L
1.5﹣0.45= 7.81+0.9= 7.5﹣2.5=
12÷0.4= 9.56+4.44= 2.9+3.7+2.1=
23= 1.25×5×8= 7.6×8+2.4×8=
① -( )
② +( )
③
④ -( )
① =
② =
③ =
④ =