https://imglink. ru/show-image. php?id=770e3750ee6e74156c81c111d7ab1a0d Решите пожалуйста системы
Ответ:
1)2x-3y=7
3x+2y=9
6x-9y=21
6x+4y=18
-13y=3
y=-13/3
x= -3
2) x-y=-1
x ²-y ²=10
(x-y)(x+y)=10
x=y-1
y-1+y=-10
x=y-1
x=-5.5
y=-4.5
3) x+y=-7
xy=6
x=-7-y
y(-7-y)=6
x=-7-y
y²+7y+6=0
x=-7-y
x= -1 или x=-6
y= -6 y=-1
4) x+y=2
x³+y³=8
x=2-y
(x+y)(x²-xy+y²)=8
x=2-y
(2-y)²-y(2-y)+y²=4
x=2-y
4-4y+y²+y²-2y+y²=4
x=2-y
3y²-6y=0
y=0 или y=2
x=2 x=0
Ответ #2:
1)2x-3y=7
3x+2y=9
6x-9y=21
6x+4y=18
-13y=3
y=-13/3
x= -3
2) x-y=-1
x ²-y ²=10
(x-y)(x+y)=10
x=y-1
y-1+y=-10
x=y-1
x=-5.5
y=-4.5
3) x+y=-7
xy=6
x=-7-y
y(-7-y)=6
x=-7-y
y²+7y+6=0
x=-7-y
x= -1 или x=-6
y= -6 y=-1
4) x+y=2
x³+y³=8
x=2-y
(x+y)(x²-xy+y²)=8
x=2-y
(2-y)²-y(2-y)+y²=4
x=2-y
4-4y+y²+y²-2y+y²=4
x=2-y
3y²-6y=0
y=0 или y=2
x=2 x=0
Источник: https://znanija.com/task/314712