面积=2×(8×4+6×4)+8×6-25.4=134.6134.6×4=538.4答:粉刷这个教室需要升坦扰花538.4元吵旦信前
(8*4*4+8*6-25.4)*4=(128+48-25.4)*4=150.6*4=602.4元
(8*6+6*4+8*4)*2=208(208-25.4)*4=730.40
4+(8*6+6*4*2+6*4*2-25.4)=474.4