997+86 =1000-3+90-4=(1000+90)-(3+4)=1090-7=1083
67.99=67.(100-1)=67.100-67=6700-67=6633
997+86 =1000-3+90-4=(1000+90)-(3+4)=1090-7=1083
67.99=67.(100-1)=67.100-67=6700-67=6633
997+86 =1000-3+90-4=(1000+90)-(3+4)=1090-7=1083
67.99=67.(100-1)=67.100-67=6700-67=6633
* 997 + 86
= (1000 - 3) + 86
= 1000 + 83
= 1083
* 67 x 99
= 67 x (100 - 1)
= 67 x 100 - 67 x 1
= 6700 - 67
= 6633
(Tíck cho mìk vs nhé!)
997 + 86 = 997 + 3 + 83 = 1000 + 83 = 1083
67 x 99 = 67 x ( 100 - 1) = 67 x 100 - 67 = 6700 - 67 = 6633
