已知a-b=180 (80%a+20%b)/(a+b)=32%怎么解
问题描述:
已知a-b=180 (80%a+20%b)/(a+b)=32%怎么解
答
(80%a+20%b)/(a+b)=32%
(80a+20b)/(a+b)=32
80a+20b=32(a+b)
80a+20b=32a+32b
80a-32a+20b-32b=0
48a-12b=0
4a-b=0
b=4a
a-b=180
a-4a=180
-3a=180
a=-60
b=4a=-60*4=-240