Question

计算下面各题,怎样简便就怎样计算-|||-5/7+5/6+2/7

Answer 1

|||-5/7+5/6+2/7简便计算方法如下：

1；!15/2+35/4!*2/5＝!3/2+7/4!*2＝3+3.5＝72 ＝5/9*20-5/9*2＝5/9*18＝103 6/5*6/7-6/5*1/7＝6/5*5/7＝6/74 ＝34/35*35-34/35＝34-34/35＝33又1/355 !2/3-1/4!*36＝24-9＝156 ＝6/19*13/17+6/19*4/17＝6/19,2,

6/7÷534/35×342/31/2+1/4÷1/366/19×13/17+4/19×6/11）475+57+43 =475+（57+43）=475+100 =57（2）25×（6×4）=25×4×6=100×6=600（3）63×73-63×63=63×（73-63）=63×10=630(15/2+35/4)×2/55/9×20-10/96/5×6/7-

(10+9+8+7+...+1)-7/55(1+2+3+4+...+10)(去括号合并同类项)=55-7/55*55(我1到10的连加不说明)=55-7=48(10-7/55*1)+(9-7/55*2)+(8-7/55*3)+······+(1-7/55*10)=48