计算 ：51.2 ×8.1 + 11 ×9.25 + 537 ×0.19
稍作处理，题中数字就能凑整化简，
原式=51.2×8.1+11×9.25+(512+25)×0.19
=51.2×8.1+11×9.25+512×0.19+25 ×0.19
=51.2×8.1+51.2 ×1.9+11×9.25+0.25×19
=51.2×10+11×0.25+11×9+0.25×19
=512+0.25×30+99
=611+7.5
=618.5