Question

[Trần Quang Huy]

k) 4 x 113 x 25 - 5 x 112 x 20

p) 1235 x 6789 x ( 630 - 315 x 2 ) :1996

l) 54 x 113 + 45 x 113 + 113

u) ( 500 x 9 - 250 x 18 ) x ( 1 +2 +3 +.......+ 9 ) 

Answer 1

[Lung Thị Linh]

k) 4 x 113 x 25 - 5 x 112 x 20

= (4 x 25) x 113 - (5 x 20) x 112

= 100 x 113 - 100 x 112

= 100 x (113 - 112)

= 100

p) 1235 x 6789 x (630 - 315 x 2) : 1996

= 1235 x 6789 x (630 - 630) : 1996

= 1235 x 6789 x 0 : 1996

= 0

l) 54 x 113 + 45 x 113 + 113

= 113 (54 + 45 + 1)

= 113 x 100

= 11300

u) (500 x 9 - 250 x 18) x (1 + 2 + 3 + ... + 9)

= (2 x 250 x 9 - 250 x 2 x 9) x (1 +2 + 3 + ... + 9)

= 0 x (1 + 2 + 3 + ... + 9)

= 0