Question

tinh bang cach thuan tien nhat.

a, 1357 x 28 + 73 x 1357 - 1357.

b, 121 + 125 + 129 + 133 +137 + 141 + 145 + 149 + 153.

Answer 1

1357 x 28 + 73 x 1357 - 1357 = 1357 x 28 + 72 x 1357 = 1357 x ( 72 + 28 ) = 1357 x 100 = 135700 . tick đ-ú-n-g nhé

Answer 2

a, 1357 x (28 + 73 - 1) 

 = 1357 x ( 101 - 1)

 = 13 57 x 100 

 = 135700

b, 121+125+129+133+137+141+145+149+153

=(121+149)+(125+145)+(129+141)+(137+133)+153

=170+170+170+170+153

=170x4+153

=680+153

=833

Answer 3

helllo anh