①2.4×5=
② ×91=
③0.42=
④1÷ ×6=
⑤6.8-0.71-1.39=
⑥2- + =
⑦ ×4÷ ×4=
⑧21×199≈
①(1000× -160)÷
②39.25×99+39.25
③48×75%+53× -0.75
④[ -( - )]×
⑤1.25×48×2.5
①x÷ =
②x﹣ x=4.2
③ x÷2=
④x∶ =