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mk nhầm, phải là ntn:
Cho dang dug cua tu
My mother is a light (sleep) sleeper . The (slight)slightest noise can wake her up.
1. What does your brother often do after school?
2. How do you go to school?
3. Do you ike math?
4. When does your mother do the housework?
5. Does your brother often go jogging in the morning?
\(xy=x-y\Rightarrow xy-x+y=0\Rightarrow\left(xy-x\right)+\left(y-1\right)=-1\)
\(\Rightarrow x\left(y-1\right)+\left(y-1\right)=-1\Rightarrow\left(x+1\right)\left(y-1\right)=-1\)
=> -1 chia hết cho x+1 và y-1
=> x+1 và y-1 là ước của -1
Nếu x+1 = 1=> x= 0 thì y-1 = -1 => y =0 => (x;y)= (0;0) (loại )
vì x, y khác 0 (gt)
Nếu x+1 = -1 => x = -2 thì y-1 = 1 => y= 2 => (x;y) (-2;2) ( thỏa mãn )
Khi đó \(\frac{1}{x}-\frac{1}{y}=\frac{1}{-2}-\frac{1}{2}=-1\)
Cho dang dug
1 I ' m really interested in this book . It ' s full of __useful__ information . ( use )
2 The local people were very __friendly__ towards us . ( friend )
3 It ' s important to exercise ___regularly__ . ( regular )
4 Is there a good restaurant is the ___neighborhood____ ? ( neighbor )
5 The ___energetic__ students often play game at recess . ( energy )
1 I ' m really interested in this book . It ' s full of _useful___ information . ( use )
2 The local people were very __friendly__ towards us . ( friend )
3 It ' s important to exercise _regularly____ . ( regular )
4 Is there a good restaurant is the ___neighborhood____ ? ( neighbor )
5 The __energize___ students often play game at recess . ( energy )