199+49=
10﹣0.01=
5+1.4+1.6=
2.5×40=
× =
24÷ =
+ =
÷2÷ =
①841﹣3248÷16
②25%×32×1.25
③ × + × .
① x+25%=
② x﹣ x=
③x:10= : .