Tính bằng hai cách: 27,29 - 14,13 - 2,5 ; 29,82 - ( 11,6 + 10,3
Giải thích
27,29−14,43−2,5Cách 1:27,29−14,4⏟3−2,5= 12,86 −2,5= 10,36Cách 2:27,29−14,43−2,5=27,29−14,43+2,5⏟=27,29−16,93=10,3629,82−11,6+10,3Cách 1:29,82−11,6+10,3⏟=29,82−21,9=7,92Cách 2:29,82−11,6+10,3=29,82−11,6⏟−10,3= 18,22 −10,3=7,92