用竖式计算.①3.63+0.87= ②13﹣7.86= ③8.5+11.75= ④7+3.02=
128×10 + 71×
(1)238÷238(2)
(1)×39 + ×27 (2)18.25×11 - 17÷ (1 - )
(1)64× (2) 54÷17