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nhutplus
2 năm trước
cho biết hai đại lượng x,y tỉ lệ thuận với nhau và khi x=6 thì y=4. a,tìm hệ số tỉ lệ k của y đối với x b,hãy biểu diễn y theo x c,tính giá trị của y khi x=9,x=15
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