a, (- 12/9) : (-28/27) b,(5/21 . 21/15) : 1/4 c,(2/7:5/4).(5/8:2) d,2/3x - 4/7 = 1/8 e,2/7 - 8/9x = 2/3 g,4/7 + 5/9 : x = 1/5 h,2/5 - 2/5x = 2/5 nhanhhhhhhhh giúp em vs ạ 13:15 emm đi hc rr-((((

a, (- 12/9) : (-28/27) b,(5/21 . 21/15) : 1/4 c,(2/7:5/4).(5/8:2) d,2/3x - 4/7 = 1/8 e,2/7 - 8/9x = 2/3 g,4/7 + 5/9 : x = 1/5 h,2/5 - 2/5x = 2/5 nhanhhhhhhhh giúp em vs ạ 13:15 emm đi hc rr-((((
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