x÷0.2=7.2 △2x-3.42=6.4
138-x=57 4x+6x=18
①+x=
②4x-=
③-x=
①x÷=
②45+4x=98
③8.6x-x=16.8
0.4÷0.2= 1÷= 406﹣299= a﹣a×0=