(a+b)c=1.①
(1.2a+b)×0.9c=1 .②
(a+0.75b)(c+2.5)=1.③
①÷②整理得b=0.8a代入②得1.8ac=1.④
代入③得1.6a(c+2.5)=1.⑤
④⑤联立解得a=1/36,c=20,再带入前式得b=1/45.
(a+b)c=1.①
(1.2a+b)×0.9c=1 .②
(a+0.75b)(c+2.5)=1.③
①÷②整理得b=0.8a代入②得1.8ac=1.④
代入③得1.6a(c+2.5)=1.⑤
④⑤联立解得a=1/36,c=20,再带入前式得b=1/45.