计算:13.5÷[1.5×(1.07+1.93)];÷[(+)×];(0.265×3+3×0.735)×54.
x-x=
(2.4×1.5-1.5)÷0.7
(3.2+3.2+3.2+3.2) ×2.5
+-
3600÷45×90