16÷20%= 4.8÷(0.4+1.2)=
-(-)= 12÷0.25÷4=
+ = 1- = 1.25× = - =
0.9+99×0.9= 0÷ = 1÷ = -0.5=
0.6×101= 3.2×2.5×12.5=