пусть t=x+y ,тогда
2t²-7t+3=0
D=49-24=25
√D=5
t₁=(7+5)/4=3
t₂=(7-5)/4=1/2
1)x+y=3
2x-3y=-1
x=3-y
2(3-y)-3y=-1
6-2y-3y=-1
5y=7
y=7/5 x=3-y=8/5
2)x+y=1/2
x=1/2-y
2(1/2-y)-3y=-1
2-2y-3y=-1
5y=3
y=3/5 x=1/2-y=-1/10
пусть t=x+y ,тогда
2t²-7t+3=0
D=49-24=25
√D=5
t₁=(7+5)/4=3
t₂=(7-5)/4=1/2
1)x+y=3
2x-3y=-1
x=3-y
2(3-y)-3y=-1
6-2y-3y=-1
5y=7
y=7/5 x=3-y=8/5
2)x+y=1/2
2x-3y=-1
x=1/2-y
2(1/2-y)-3y=-1
2-2y-3y=-1
5y=3
y=3/5 x=1/2-y=-1/10