(345+543)×23-(12327+21345)÷23=
1) 345+543=888, 2) 12327+21345=33672, 3) 888×23=20424, 4) 33672:23=1464, 5) 20424-1464=18960
(345+543)×23-(12327+21345):23=576 1)345+543=888 2)12327+21345=33672 3)888×23=20424 4)33672-20424=13248 5)13248:23=576