1)Tìm 5 giá trị của x sao cho a)2<x<3 ...... b)0,71>x>0,6 ..... c)0,11<x<0,12 ... 2) Tìm một số,Biết rằng nếu lấy số đó chia cho 0,25 rồi trừ 7,5 Thì cũng bằng kết quả khi lấy số đó nhân với 0,25 rồi cộng 7,5

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