Question

Tìm x,y biết:

a) x - y = xy = x:y

b) x + y = xy = x:y

Answer 1

a)0-0=0x0=0:0

b)0+0=0x0=0:0

Đúng thì tk nha

Answer 2

\(x-y=xy=\dfrac{x}{y}\)

Ta có:

\(x-y=xy\Leftrightarrow x-y-xy=0\)

\(\Leftrightarrow x-y-xy+1=1\)

\(\Leftrightarrow x\left(1-y\right)+1\left(1-y\right)=1\)

\(\Rightarrow\left(x+1\right)\left(1-y\right)=1\)

Xét ước nhé

\(x+y=xy=\dfrac{x}{y}\)

Ta có:

\(x+y=xy\Leftrightarrow x+y-xy=0\)

\(\Leftrightarrow x+y-xy-1=-1\)

\(\Leftrightarrow x\left(1-y\right)-1\left(1-y\right)=-1\)

\(\Leftrightarrow\left(x-1\right)\left(1-y\right)=-1\)

Xét dấu nha