Question

[loan loan]

tìm x,y,z biết

12/-6 = x/5 = -y/3 = z/-7

Answer 1

[Đinh Đức Hùng]

\(\frac{12}{-6}=\frac{x}{5}\Rightarrow x=\frac{12.5}{-6}=\frac{2.3.2.5}{-1.2.3}=\frac{2.5}{-1}=\frac{10}{-1}=-10\) 

\(\frac{-10}{5}=\frac{-y}{3}\Rightarrow-y=\frac{-10.3}{5}=\frac{-1.2.5.3}{5}=\frac{-1.2.3}{1}=\frac{-6}{1}=-6\Rightarrow y=6\)

\(\frac{-6}{3}=\frac{z}{-7}\Rightarrow z=\frac{-6.\left(-7\right)}{3}=\frac{-2.3.\left(-7\right)}{3}=\frac{-2.\left(-7\right)}{1}=14\) 

Vậy x = 10 ; y = 6 ; z = 14

Answer 2

[Nguyễn Hưng Phát]

Ta có:\(\frac{12}{-6}=\frac{-60}{30}=\frac{-10}{5}=\frac{-6}{3}=\frac{-42}{21}=\frac{14}{-7}\)

=>x=-10

-y=-6

z=14

=>x=-10

y=6

z=14