Question

(1/13+1/23+33/1+43/1)*(1/23+33/1+43/1+1/53)-(1/13+1/23+33/1+43/1+1/53+1/63)*(1/23+33/1+43/1)

Answer 1

(1/13+1/23+33/1+43/1)×(1/23+33/1+43/1）+ (1/13+1/23+33/1+43/1)×1/53 -
(1/13+1/23+33/1+43/1)×(1/23+33/1+43/1) -
(1/53+1/63)×(1/23+33/1+43/1)
= 1/13×1/53 +
(1/23+33/1+43/1)×1/53 -
1/53×(1/23+33/1+43/1) -
1/63×(1/23+33/1+43/1)
= 1/13×1/53 - 1/63×1/23 - 1/63 × 76
= ((63×23)-(13×53)-13×53×23×76)/(13×53×63×23)
= (1449-689×1749)/(13×53×63×23)
= -1203612/(13×53×63×23)
= -4×3×100301/(13×53×21×3×23)
= -401204/332787
算出来数字真大啊!