①
②
③
④
⑤
⑥
15×60= 640÷40= ÷ = 398÷202≈ 6.9÷0.1=
1.05-0.65= 0.8×125%= 5- = ÷6= 910-430=
①612÷18+780÷30
②2.5×32×12.5
③5÷(0.5+)×
⑤()
⑥16×+8×+12÷25