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x+y=2,x-y=-1/2求x^2-y^2(两种方法解）
题目详情
x+y=2,x-y=-1/2求x^2-y^2(两种方法解）
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答案和解析
1、x^2-y^2=（x+y）（x-y）=2（-1/2）=-1
2、解方程x+y=2,x-y=-1/2
X=3/4
y=5/4
x^2-y^2=(3/4)^2-(5/4)^=9/16-25/16=-1
2、解方程x+y=2,x-y=-1/2
X=3/4
y=5/4
x^2-y^2=(3/4)^2-(5/4)^=9/16-25/16=-1
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