Question

tim x va y biet      

a)x/18=y/15 va x-y=-30

b)7*x=9*y va 10*x-8*y=68

c)(x1/2)^50 +(y+1/3)^40=o

Answer 1

a)

\(\frac{x}{18}=\frac{y}{15},x-y=-30\)

\(\frac{x}{18}=\frac{y}{15}\)

\(\frac{x}{18}-\frac{y}{15}=0\)

\(-\frac{6y-5x}{90}=0\)

\(6y-5x=0\)

\(x-y=-30\)

\(-\left(y-x-30\right)=0\)

\(y-x-30=0\)

\(\Rightarrow x=-180;y=-150\)

Answer 2

dẫn tui bài y:9-8=15 với