99×1.89 ×+÷9 1.25×0.4×8×2.5
1.25×32×0.25
× +15×0.375+0.4×37.5%
÷ ×(1﹣ )
①×+×
②×(2÷)
③÷(1﹣(+)]
④12.5×0.97×0.8
⑤6000÷(75﹣60)+20
⑥(+﹣)×48