2/5+3/5.-25/9 -3/7+5/14-4/7+3/12+9/14 -4/13.5/11+-4/13:11/6+18/26 6/1.4+6/4.7+6/7.10+.....+6/46.49 bài 2 2.(x+5/2)²-5/12=1/12 x-2/4=11-x/8

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