Question

若｜3x-9｜+｜1/2y+1｜=0,则1/3X-1/2y=z+5/6,字母z=?

Answer 1

wolovehudg

∵|3x-9|+|1/2y+1|=0

且|3x-9|≥0,|1/2y+1|≥0

∴3x-9=0,1/2y+1=0

解得x=3,y=-2

∴1/3x-1/2y=z+5/6

(1/3)×3-(1/2)×(-2)=z+5/6

1+1=z+5/6

z=2-5/6

z=7/6

∴字母z=7/6