计算过程方法如下
解:8.57×9.9-0.857
=8.57×(10-0.1)-0.857
=8.57x10-8.57x0.1-0.857
=85.7-0.857-0.857
=85.7-0.857x2
=85.7-1.714
=83.986
解:8.57×9.9-0.857等于( 41993/500 ),【即等于83.986】
∵已知需求出8.57×9.9-0.857等于多少
X × Y - X × Z = X × (Y - Z)
∴8.57 × 9.9 - 0.857
= 0.857 × (9.9 × 10 - 1)
= 857/1000 × (99 - 1)
= 857/1000 × 98
= 41993/500
= 83.986
答:8.57×9.9-0.857等于41993/500,【即等于83.986】
8.57×9.9-0.857
=8.57×(10-0.1)-0.857
=8.57x10-8.57x0.1-0.857
=85.7-0.857-0.857
=85.7-0.857x2
=85.7-1.714
=83.986