... a/ ( -2 ,5.0 ,38 .0,4) – [0 , 12 5 .3 ,15 . (-8 )] = [ ( -2 ,5).0,4.0 ,38 ] – [ (-8 .0 , 12 5.) .3 ,15 ] = [( -1 ) .0 ,38 ]-[ ( -1 ) .3 ,15 ] = -0 ,38 – ( -3 ,15 ) = 2 ,77 BT25 /16 |x -1 ,7| = 2 ,3 ta có x– 1 ,7 = 2 ,3 hoặc x– 1 ,7 = -2 ,3 x ... 36 = 13 39 < 13 38 ⇒ 12 37 − − < 12 37 − − HS:Đọc BT24 HS: a/ ( -2 ,5.0 ,38 .0,4) – [0 , 12 5 .3 ,15 . (-8 )] = [ ( -2 ,5).0,4.0 ,38 ] – [ (-8 .0 , 12 5.) .3 ,15 ] = [( -1 ) .0 ,38 ]-[ ( -1 ) .3 ,15 ] = -0 ,38 – ( -3 ,15 ) = 2 ,77 ... HS:Đọc BT3 HS:x = 7 2 − = 77 22 − ; y = 11 3 − = 77 21 − vì -2 2& lt ;- 21 ⇒ x<y x = 30 0 2 13 − ; y = 25 18 − = 30 0 21 6 − vì - 2 13 > ;- 21 6 ⇒ x>y x = -0 ,75 = 10 0 75 − ; y = 4 3 − = 10 0 75 − ⇒ x...