×44= 5-= ×= ×12=
-= ×= ×0.36= ×=
×= 1.8×= ×= ×=
×= ×24= 2.4×= ×0=
×2= ×12= ×= ×=
×= = = =
×24= 1.8×= ×= ×10=
0.9+99×0.9=
2.5× ×0.4=
( )×6=
1-1 =
1.02-0.43-0.57=
20-19.02=
2÷ - ÷2=