计算下面各题。(1)++ (2)++
竖式计算我最行。(带※得数保留一位小数)0.83×3.2= ※2.7×5.1≈ 1.5×0.45=
1.8×2.4- 1.8×0.24= 180×2.4= 180×0.24= 0.18×0.24= 0.18×0.24=
x : =:
x - x=18.7
15.8-(6+÷12.5%)