2/9 - 5/-12 + (-3)/4 = (-4/9) . 3/8 + 1/18 2/7 + 28/27 : (-4/9)

2/9 - 5/-12 + (-3)/4 = -1/9

(-4/9) . 3/8 + 1/18=-1/6+ 1/18=-1/9

2/7 + 28/27 : (-4/9)=2/7+(-7/3)=-43/21

xin 5* vs ctlhn ạ