Question

tính bằng cách thuận tiện nhất

( 15 + 17 + 19 ... + 57 + 59 )  x ( n :1 - n x1 )

 

 

 

 

Answer 1

= 0 vì dấu ngoặc đầu tiên giữ nguyên dấu ngoặc còn lại tính như sau : n : 1 = n

n x 1 = n mà n- n = 0 = > Kết quả =0

Answer 2

bằng 0 

TICK CHO MIK NHA!

Answer 3

o tic nha

Answer 4

(15+17+19/.....+57+59) x 0

=0

Answer 5

0

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