0.8×4= 0.25×0.4= 5.3-1.7= 9.8÷ 100= 0.72÷0.8=
6×0.5= 3.6÷0.09= 10×3.75= 0.32= 2y+7y=
①612÷18+780÷30
②2.5×32×12.5
③5÷(0.5+)×
④
⑤()
⑥16×+8×+12÷25
①2.4÷×
②(+﹣)×36
③×99
④29.3﹣12.6﹣7.4
⑤5.9×8.5﹣49×0.85
⑥×[6÷(﹣)]