a) -3/7+5/13+-4/13b) -5/21+-2/21+8/24c) -5/9+8/15+-2/11+4/-9+7/15d)-7/19.8/11+3/11.7/19+-12/19e) -7/25.39/-14.50/78g) (3/8+-3/4+7/12):5/6+1/2h) 2/5.1/3-2/15:1/5+3/5.1/3i) 9/27+8/24+18/27--16/24+2/3Giúp mik vs nha mnMik đang cầm gấp
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