1997+1998+1999+1998*97的简便算法是什么?
问题描述:
1997+1998+1999+1998*97的简便算法是什么?
答
(1998-1)+1998+1998+1+1998*97=1998*100=199800
答
=(1998-1)+1998+(1998+1)+1998*97
=1998*(97+3)
=1998*100
=199800
答
1997+1998+1999+1998*97
=1997+1999+1998+1998*97
=1998+1998+1998+1998*97
=1998*(1+1+1+97)
=1998*100
=199800
答
1998-1+1998+1998+1+1998*97=1998*100
答
1997+1998+1999+1998*97=(1997+1)+1998+(1999-1)+1998*97=1998*(3+97)=199800
答
(1998-1)+1998+(1998+1)+1998*97=1998*(1+1+1+97)-1+1=1998*100=199800