Question

1+2+3+4+5+6+7+8+9+x+29=90

Answer 1

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + x + 29 = 90

x = 90 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 29

x=             16

vậy x = 16

Answer 2

\(1+2+3+4+5+6+7+8+9+x+29=90\)

\(\Rightarrow x=90-\left(1+2+3+4+5+6+7+8+9+29\right)\)

\(\Rightarrow x=90-74\)

\(\Rightarrow x=16\)

Vậy x = 16

_Chúc bạn học tốt_

Answer 3

1 + 2 + 3 + 4 + 5 + 5 + 6 + 7 + 8 +9 + x + 29 = 90

x = 90 - ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 29 )

x = 90 - 74

x = 16 

 Vậy x = 16

Answer 4

1 + 2 + 3 + 4+ 5 + 6 + 7 + 8 + 9 + x + 29 = 90

x = 90 - ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 29 ) 

x = 90 - 74

x = 16.