\(\dfrac{x}{2}=\dfrac{y}{3};\dfrac{y}{4}=\dfrac{z}{5}\Rightarrow\dfrac{x}{8}=\dfrac{y}{12}=\dfrac{z}{15}\)

áp dụng t/c dãy tỉ số bằng nhau ta có: 

\(\dfrac{x}{8}=\dfrac{y}{12}=\dfrac{z}{15}=\dfrac{x-y-z}{8-12-15}=\dfrac{38}{-19}=-2\)

=> x=-16;y=-24;z=-30 

we finally thought of a way to get the band into the hotel without the press knowing PUZZLE

-> we finally ........................................................... to get to the band into the hotel without the press knowing

the champion tried not to let it show, but he had tears in his eyes as they gave him the cup HOLD

-> the champion tried to ..................................... in his eyes as they gave him the cup 

Jenny passed the test and didn't make any mistakes THROUGH

-> Jenny ........................................ making any mistakes 

it's difficult to overcome the gender barrier in some industries BREAK

-> it's difficult to .......................... barrier in some industries 

Sheku began by competing in the strings competition before getting to the overall final.  OUT

-> sheku ................................. a competitor in the strings competition before getting to the overall final

they nearly managed to get the loan but failed to obtain it PULL

-> they nearly managed to get the loan but failed .......................................

when I heard that song for the first time I was astonished by its meaningful lyrics BLOW

-> when I heard that song for the first time, its ..............................................

Cho biểu thức A=\(\dfrac{1}{x-2}+\dfrac{1}{x+2}+\dfrac{x^2+1}{x^2-4}\left(x\ne2;x\ne-2\right)\)

CMR với mọi giá trị của x thoả mãn -2<x<2 và \(x\ne-1\) thì phân thức luôn nhận giá trị âm 

Tính \(\left(\dfrac{1-\sqrt{5}}{2}\right)^{16}-\left(\dfrac{1+\sqrt{5}}{2}\right)^{16}\)

Nêu các hình chiếu vuông góc của các khối đa diện, các khối tròn xoay thường gặp.