Question

x y=0.1 0.2x=0.74y这个方程怎么解？

一元二次方程

Answer 1

0.2x = 0.74y, 得 x = 3.7y, 代入 x+y = 0.1，
得 4.7y = 0.1, 则 y = 1/47, x = 3.7/47 = 37/470，

Answer 2

0.2x=0.74y
可以推出：x=3.7y
将x=3.7y带入xy=0.1
可得：3.7yy=0.1
即 y^2=1/37
对y开方：y=±√37/37
所以 x=3.7y=±√37/10