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dungdeptrai2018
2 năm trước
GIÚP TUI NHA :<< a) 3x=2y ; 7x=5z ; và x-y+z = 32 b) x/3 = y/4 ; y/3 =z/5 và 2x - 3y +z = 6 c ) 2x/3= 3y/4 = 4z/5 và x+y + z = 49 d) x-1 / 2 = x-2/3=z-3/4 và 2x+3y-z=50
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