解下列方程组1.(x-y+2)(x+y)=0 x²+y²=8 2.(x+y)(x+y-1)=0 (x-y)(x-y-1)=0

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解下列方程组1.(x-y+2)(x+y)=0 x²+y²=8 2.(x+y)(x+y-1)=0 (x-y)(x-y-1)=0
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解下列方程组1.(x-y+2)(x+y)=0 x²+y²=8 2.(x+y)(x+y-1)=0 (x-y)(x-y-1)=0
解下列方程组1.(x-y+2)(x+y)=0 x²+y²=8 2.(x+y)(x+y-1)=0 (x-y)(x-y-1)=0

解下列方程组1.(x-y+2)(x+y)=0 x²+y²=8 2.(x+y)(x+y-1)=0 (x-y)(x-y-1)=0
1.如果是初中数学可以有偷懒的方法,就是两数相乘=0
必然至少其中之一为0
1、如果x+y=0
则x=-y,带入x²+y²=8
得到x=2,y=-2 或者x=-2,y=2
2、如果x-y+2=0
则x=y-2带入x²+y²=8
得x=√3-1,y=√3+1 或x=-√3-1 ,y=-√3+1