a)x/y=2/5va x+y=-28

Ta có:x/y=2/5=>x/2=y/5

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

x/2=y/5=x+y/2+5=-28/7=-4

=>x/2=-4=>x=-8

y/5=-4=>y=-20

Vậy x=-8

y=-20

A, Who do you like to play most in your class?

B, Which school are you in?

GOOD LUCK!

=15625

áp dụng t/c dãy tỉ số = nhau ta có:\

\(\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}=\frac{\left(x-1\right)-2\left(y-2\right)+3\left(z-3\right)}{2-2.3+3.4}=\frac{\left(x-2y+3z\right)-1+4-9}{8}=\frac{-10-6}{8}=-2\)

=>x-1=-4;y-2=-6;z-3=-8

=>x=-3;y=-4;z=-5

=>x+y+z=-12

sáng mai là mở vòng 1 à bn
thời hạn nộp bài là.... ngày?

1.I always love texting.

2.We have fun together

3.Mai prefers coffee to tea

4.I have fewer homeworks than my brother( không có ''do'' nha Hằng)

5.During our vacations I go swimming with my brother.

GOOD LUCK.