= = = =
=( )
2.4×0.3= 4.2÷3= 0.6a+5.4a= 0.3²= 3.2×4÷3.2×4=
6x-5x= + = = 6.4-2.12= 102×98≈
+ = - = - = 1- =
+ = + = - = 1- - =