... (-1 ,13)+ (-0 ,264) =- (1,13+0,264) =-1 ,3940,24 5-2 ,134=0,245+ (-2 ,134) =-( 2,13 4-0 ,245) =-1 ,889 (-5 ,2).3,14 =-( 5,2.3,14) =-1 6,328 (-0 ,408) : (-0 ,34)= +(0,408:0,34) =1,2 -3 ,116+0,263 =-( 3,11 6-0 ,263) =-2 ,853 (-3 ,7) . (-2 ,16)=3 ,7. 2,16 =7, 9922) ... =1,2 -3 ,116+0,263 =-( 3,11 6-0 ,263) =-2 ,853 (-3 ,7) . (-2 ,16)=3 ,7. 2,16 =7, 9922) Cộng trừ nhân chia số thập phân Ví dụ 1:(sgk) (-1 ,13)+ (-0 ,264) =- (1,13+0,264) =-1 ,3940,24 5-2 ,134=0,245+ (-2 ,134) =-( 2,13 4-0 ,245) =-1 ,889 (-5 ,2).3,14 =-( 5,2.3,14) ... (1,13+0,264) =-1 ,3940,24 5-2 ,134=0,245+ (-2 ,134) =-( 2,13 4-0 ,245) =-1 ,889 (-5 ,2).3,14 =-( 5,2.3,14) =-1 6,328Ví dụ 2:(sgk) (-0 ,408) : (-0 ,34)= +(0,408:0,34) =1,2 -3 ,116+0,263 =-( 3,11 6-0 ,263) =-2 ,853 (-3 ,7) . (-2 ,16)=3 ,7. 2,16 =7, 992Hot ng 4. Cng c v hng...