Question

[Duy Ngô]

Tính thuận tiện:
a) 125 x 1,2 + 1,2 x 874 + 1,2
b) 24,369 x 99 + 24,369 x (7 : 4 – 0,75)   

Answer 1

[Hakimiru Mesuki]

a, 125 x 1,2 + 1,2 x 874 + 1,2

=125 x 1,2 + 1,2 x 874 + 1,2 x 1

= 1,2 x (125+874+1)

= 1,2 x 1000

= 1200

b, 24,369 x 99+24,369 x (7:4 - 0,75)

= 24,369 x 99 + 24,369 x (1,75-0,75)

= 24,369 x 99 + 24,369 x 1

= 24,369 x (99+1)

= 24,369 x 100

= 2436,9

Answer 2

[Van Toan]

\(a,125\times1,2+1,2\times874+1,2\\ =\left(125+874+1\right)\times1,2\\ =1000\times1,2\\ =1200\\ b,24,369\times99+24,369\times\left(7:4-0,75\right)\\ =24,369\times99+24,369\times\left(1,75-0,75\right)\\ =24,369\times99+24,369\times1\\ =24,369\times\left(99+1\right)\\ =24,369\times100\\ =2436,9\)