(x-y)(x y)=5,(x y)平方=4,试求x-y的值(x-y)(x +y)=5,(x+ y)平方=4,试求x-y的值

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(x-y)(xy)=5,(xy)平方=4,试求x-y的值(x-y)(x+y)=5,(x+y)平方=4,试求x-y的值(x-y)(xy)=5,(xy)平方=4,试求x-y的值(x-y)(x+y)=5,(

(x-y)(x y)=5,(x y)平方=4,试求x-y的值(x-y)(x +y)=5,(x+ y)平方=4,试求x-y的值
(x-y)(x y)=5,(x y)平方=4,试求x-y的值
(x-y)(x +y)=5,(x+ y)平方=4,试求x-y的值

(x-y)(x y)=5,(x y)平方=4,试求x-y的值(x-y)(x +y)=5,(x+ y)平方=4,试求x-y的值
(X+Y)²=4,
X+Y=±2,
∴X-Y=5÷(±2),
∴X-Y=±2.5.