... (1 ,13+0,26 4)= -1,3940,245-2,134=0,245 +(- 2,13 4) = -(2 ,134-0,24 5) =-1,889 (- 5, 2). 3,14= -(5 ,2.3,1 4) =-16,328 (- 0,40 8) : (- 0,3 4) = +(0 ,408:0,3 4) =1,2-3,116+0,263= -(3 ,116-0,26 3) =-2,853 (- 3 , 7) .(- 2,1 6) =3 ,7. 2,16 =7, 992 2) Cộng trừ ... chia số thập phân Ví dô 1:(sgk) (- 1,1 3) +(- 0,26 4) =- (1 ,13+0,26 4)= -1,3940,245-2,134=0,245 +(- 2,13 4) = -(2 ,134-0,24 5) =-1,889 (- 5, 2). 3,14= -(5 ,2.3,1 4) =-16,328VÝ dô 2:(sgk) (- 0,40 8) : (- 0,3 4) = ... nhanh435853.4358.438581.5358.4385.5353.81/412 7 18 7 1811.12 7 18 7 .12 7 12 7 .1811/352929 7 .5292.529 7 .52/2 77 , 2)1 5, 3(3 8,0]15, 3). 8 .(1 25,0 [)3 8,0.4,0.5, 2( )] 8 .(1 5,3.125,0 [)4 ,0.38,0.5,2 /(1 −=−+=−++−=−+−+−=−−=−−−=+−=−+−=−−−=−−−=−−−Bài...