77+93= 15×1-7= 39-100÷10=99-77= 23-3×7= 35-35÷5=
(1)238÷238(2)
(1)×39 + ×27 (2)18.25×11 - 17÷ (1 - )
(1)64× (2) 54÷17
(1)×8(2)75×
计算:(9+7)÷(+)