46+(-80)+34=(46+34)-80=80-80=0
hok tốt
46 + ( -80 ) + 34 = ( 46 + 34 ) - 80 = 80 - 80 = 0
115-(-85)+35-(46+35) = 115 + 85 + 35 - 46 - 35 = ( 115 + 85 ) + ( 35 - 35 ) - 46 = 200 - 46 = 154
5. ( - 9 ).2.(-7).\(^{-2020^0}\) = ( 5.2 ). ( -9 . -7 ) . 1 = 10 . 63 = 630
57 . ( 49 - 16 ) - 57. ( 24 + 49 ) = ( 49-16 - 24 - 49 ) . ( 57 - 57 ) = -40 . 0 = 0