Giải hệ phương trình :
1, \(\left\{{}\begin{matrix}x-2y=1\\2x-y=4\end{matrix}\right.\)
2, \(\left\{{}\begin{matrix}\frac{x}{y}-\frac{y}{y+12}=1\\\frac{x}{y+12}-\frac{x}{y}=2\end{matrix}\right.\)
3, \(\left\{{}\begin{matrix}3x^2+y^2=5\\x^2-3y=1\end{matrix}\right.\)
4, \(\left\{{}\begin{matrix}\sqrt{3x-1}-\sqrt{2y+1}=1\\2\sqrt{3x-1}+3\sqrt{2y+1}=12\end{matrix}\right.\)
Giải hệ phương trình :
1, \(\left\{{}\begin{matrix}\frac{2}{x}+\frac{3}{y-2}=4\\\frac{4}{x}+\frac{1}{y-2}=1\end{matrix}\right.\)
2 , \(\left\{{}\begin{matrix}\frac{2}{2x-y}-\frac{1}{x+y}=0\\\frac{3}{2x-y}-\frac{6}{x+y}=-1\end{matrix}\right.\)
3, \(\left\{{}\begin{matrix}5\left(x+2y\right)=3x-1\\2x+4=3\left(x-2y\right)-15\end{matrix}\right.\)
4, \(\left\{{}\begin{matrix}2x+y=7\\-x+4y=10\end{matrix}\right.\)
1.Tennis was something that never interested me.
\(\rightarrow\)I never used .............................
2.We must go to school in any kind of weather.
\(\rightarrow\)Whatever kind ............................
3.Swimming across this river is impossible.
\(\rightarrow\)You must find ........................
4.Althoughhe is intelligent , he doesn't do well at school.
\(\rightarrow\)In ...............................
5.The teacher didn't allow the class to leave before 4:00.
\(\rightarrow\)The teacher made.....................
1.The dates of the exam need to change . All students can take it.(in order)
\(\rightarrow\)..............
2.Looking for rainbows may be an idle person's venture . Believing in rainbows is every person's need.(while)
\(\rightarrow\)................
3.Writers should never omit revising steps . Revising can improve idea development and thought flow.(since)
\(\rightarrow\)....................
4.They caught the thief . They handed him over to the police.(Having)
\(\rightarrow\)...............
5.The author created the children's story . The author did not draw the illustrations.(but)
\(\rightarrow\)...............
1.I find his handwirting very hard to read.
\(\rightarrow\)I have difficulty ...................................
2.Success depends on your hard word.
\(\rightarrow\)The harder .....................................
3."If I were you , I wouldn't accept his offer."
\(\rightarrow\)Patricia advised ......................................
4.The cost of livng has fallen considerably in the past month.
\(\rightarrow\)There has ..............................................................................
5."Could you guard against my handbag while I go th the toilet?"
\(\rightarrow\)"Could you keep ........................................................................?"