①26+7930÷26
②÷+×1.8
③8÷14×3.7+10.3×
④(39+39+39+39)×0.25
⑤×(+÷)
⑥÷[(+)×]
15×60= 640÷40= ÷ = 398÷202≈ 6.9÷0.1=
1.05-0.65= 0.8×125%= 5- = ÷6= 910-430=