Question

abc三个数的和是9.69 ab两数的和是6.38 ac两数的差是0.03求abc是多少

Answer 1

根据题意得：a+b+c=9.69
a+b=6.38
a-c=0.03

所以：a+b+c=6.38+c=9.69
c=9.69-6.38
c=3.31

a-c=0.03
a-3.31=0.03
a=0.03+3.31
a=3.34

a+b=6.38
3.34+b=6.38
b=6.38-3.34
b=3.04
所以：a=3.34
b=3.04
c=3.31

Answer 2

根据题意列式a+b+c=9.69,又a+b=6.38，将其代去入前式为6.38+c=9.69,c=3.31,a-c=0.03, 则a=0.03+3.31=3.34,代入a+b=6.38,b=6.38-3.34,b=3.04,所以a=3.34,b=3.04,c=3.31。

Answer 3

a=6.413

b=－0.033

c=6.383