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Binhle2106
2 năm trước
a) x+1/10 + x+1/11 + x+1/12 = x+1/13 + x+1/14 b) 3/2-4(1/4-x)=2/3-7x c)(x-2/7).(x+5/4)=0 d)2/3-5/3x=7/10x+5/6
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