①2.3x-1.02=0.36
②3x+5x=840
③x÷=
④x÷2=
÷= ×8= ÷14= ÷=
×= ×= 0×= ÷=
①
②
③2.7-3x=
67+28= 960﹣540= 1.6×5= 7.5+2.7=
= = 53÷100= =