口算.
= = = 2.25+=
= 2.5×0.1= 7.5÷0.5= =
20.1+9.09= ×= ﹣= 1÷0.1﹣1×0.1=
(+)×63= 0.5÷= 0.4÷40%= 0.42﹣0.32=
口算.
= = = 2.25+=
= 2.5×0.1= 7.5÷0.5= =
20.1+9.09= ×= ﹣= 1÷0.1﹣1×0.1=
(+)×63= 0.5÷= 0.4÷40%= 0.42﹣0.32=