Question

已知方程组x/2=y/5=z x+y+z=8且3x-2y-z=a,求a的值

Answer 1

x/2=y/5=z

x=2z

y=5z

x+y+z=8

2z+5z+z=8

8z=8

z=1

x=2z=2

y=5z=5

a=3x-2y-z=3*2-2*5-1=-5