简便计算:1.(6584×101-6584)2.(21/20-14/3+42/5)×42
问题描述:
简便计算:1.(6584×101-6584)2.(21/20-14/3+42/5)×42
答
(6584×101-6584)
=6584(101-1)
=6584×100
=658400
(2)(21/20-14/3+42/5)×42
=(1+1/20+8+2/5)×42-14/3×42
=(9+9/20)×42-196
=378+23+2/5-196
=205又2/5