... |ax+b|=|cx+d| luân không âm Bình phơng vế pt ta đợc: |ax+b|=|cx+d| (ax+b)2=(cx+d)2 (a-c)x2+2(ab-cd)x +b2- d2=0 (*) Để giải phơng trình |ax+b|=|cx+d| ta giải pt(*), nghiệm pt(*) nghiệm pt cho ? Hãy giải...
... earn again money is important but not everything In short, money isn’t only thing but it is a bigthing We can’t live without money Therefore, we should live both physically & mentally TOPIC 6: ... as necessary as food and clothing It is true that media is playing an outstanding role in strengthenning the society, it is a mirror of the society It’s duty is to inform, educate the people...