Question

二元一次方程组 2x-y=a x+2y=a 则x

二元一次方程组 2x-y=a
x+2y=a
则x:y

Answer 1

2x-y-(x+2y)=a-a=0

x-3y=0
若y不等于0，则有x:y=3

Answer 2

Answer 3

Answer 4

追答

x=3/5a
y=1/5a