解方程组:①x-2y=5,②x²-y²=2(x=y)写错了,是——①x-2y=5,②x²-y²=2(x+y)
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解方程组:①x-2y=5,②x²-y²=2(x=y)写错了,是——①x-2y=5,②x²-y²=2(x+y)
解方程组:①x-2y=5,②x²-y²=2(x=y)
写错了,是——①x-2y=5,②x²-y²=2(x+y)
解方程组:①x-2y=5,②x²-y²=2(x=y)写错了,是——①x-2y=5,②x²-y²=2(x+y)
由①得,x=2y+5……③
把③代人②得,(2y+5)²-y²=2(2y+5+y),
解得y1=-3 y2=-5/3
代人③得,x1=-1 x2=5/3
∴方程组的解是{x1=-1 {x2=5/3
{y1=-3 {y2=-5/3