原式=53.5x35.3+53.5x43.2+78.5+46.5=53.5x(35.3+43.2)+78.5+46.5=53.5x78.5+78.5+46.5=78.5x(53.5+1)+46.5=78.5x54.5+46.5=4278.25+46.5=4324.75
