-=
+=
1-=
0.5×8= 3.6×0.4= 39.68×0= 7.6×1= 0.7×2.5×4=
4÷0.5= 12÷0.06= 12÷1.2= 3÷30= 7.5×1.2÷7.5×1.2=
= = = 1-0.89= =
= = 0.95- = = =