408－12×24 = 408 - 288 = 120（46＋28）×60 = 74 x 60 = 444042×50－17 = 2100- 17 = 208332＋105÷5 = 32 + 21 = 53420×（327－238） = 420 x 89 = 37380(4121+2389)÷7 = 6510 ÷7 = 9303.416÷（0.016×35）...