脱式计算. ①(﹣)÷ ②[1﹣(+)]÷ ③+﹣1.625﹣2.375+3 ④[﹣(﹣)]÷.
+-
3600÷45×90
93.6÷[(54.8+45.2)×0.06]
0.8+0.55+1.2-0.45
+-