Giải bpt sau 18 0,5 - 1 2 x-1 279 243 3r log (x + 1) = -3 2 4½ log, α + log, (bc+1) - log, (5x+12) x 5> 3t x 1 243 67 log (x-1) TO #5 log / (2x - 1) I log + loge (x+3)