a) 2459 - [ 400 + 459 ] = 2459 - 859 = 1600
b) 435 x 25 + 76 x 435 - 435 = 435 x ( 25 + 76 - 1 ) = 435 x 100 = 43500
c) 35 x 49 + 51 x 36 = 35 x 49 + 51 x ( 35 + 1 ) = 35 x 49 + 51 x 35 + 51 = 35 x ( 49 + 51 ) + 51 = 35 x 100 + 51 = 3500 + 51 = 3551
-HT-
a) 2459 - [400 + 459] b) Mk chịu c) 35 x 49 + 51 x 36
= [2459 - 459] + 400 = 35 x (49 + 51) x 36
= 2000 + 400 = 35 x 100 x 36
= 2400 = 3500 x 36
= 126000