1-= ×= 6÷= += ×4×0=
×= ×4= 1÷= ÷1= 1-÷=
①2.3x-1.02=0.36
②3x+5x=840
③x÷=
④x÷2=
①÷14×
②×÷
③÷15÷
④1÷×÷
×=
列式: