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huongduong
2 năm trước
cho (d1) y = 4mx-(m+50 (d2) y = (3m*2+1)x+m*2-4 a) cm khi m thay đổi thì d1(d2) luôn đi qua A cố định b)m=? thì d1 // d2 c)m=? thì d1 cắt d2
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