100*9.5*0.98*9.5*2 54.3*1.8+54.3*0.3-54.3*0.1这2题怎么简便计算

100×9.5×0.98×9.5×2
=9.5×98×9.5×2
=931×19
=17689
上面一题的题目是不是有错.
54.3×1.8+54.3×0.3-54.3×0.1
=54.3×(1.8+0.3-0.1)
=54.3×2
=108.6