Bài `bb2`$\\$ `3:)(-3)/7 * 5/9 + 4/9 * (-3)/7 + (-2024)^0`$\\$ `= (-3)/7 * (5/9+4/9) +1`$\\$ `= (-3)/7*1+1` $\\$ `= (-3)/7+1` $\\$ `= 4/7` $\\$ `4:) 0,75 - (2 1/3 + 0,75) + 3^2 . (-1/9)` $\\$ `= 0,75 - (7/3+3/4) + 9 . (-1/9)` $\\$ `= 3/4 - 37/12-1` $\\$ `= 9/12-37/12-12/12` $\\$ `= -40/12=-10/3` $\\$ `6:) (-2)^3 * (-1)/24 + (4/5-1,2) :2/15` $\\$ `= -8 *(-1)/24 + (0,8-1,2) :2/15` $\\$ `= -8*(-1)/24-0,4*15/2` $\\$ `= 1/3-2/5*15/2`$\\$ `= 1/3-3`$\\$ `= 1/3-9/3`$\\$ `= -8/3`$\\$ `7:) 1 13/15 * 0,75 - (11/20+25%) :1 2/5` $\\$ `= 28/15 * 3/4 - (11/20+1/4) :7/5`$\\$ `= 28/15*3/4-(11/20+5/20) :7/5`$\\$ `= 28/15*3/4-4/5*5/7`$\\$ `= 7/5-4/7`$\\$ `= 49/35-20/35` $\\$ `= 29/35`$\\$ `8:) (-2,4+1/3) :3 1/10 + 75% + 1 1/2`$\\$ `= (-12/5+1/3) :31/10+3/4+3/2` $\\$ `= (-36/15+5/15) :31/10+3/4+3/2`$\\$ `= -31/15:31/10+3/4+3/2`$\\$ `= -31/15*10/31+3/4+3/2` $\\$ `= -2/3+3/4+3/2`$\\$ `= -8/12+9/12+18/12` $\\$ `= 19/12`$\\$