Question

x+(x+1)+(x+2)+290+291=581

 

Answer 1

x+(x+1)+(x+2)+290+291=581 

x+(x+1)+(x+2)+290 = 581 - 291

x+(x+1)+(x+2)+290= 290

x+(x+1)+(x+2) = 290 - 290

x+(x+1)+(x+2) = 0

3x+3 = 0

3x = 0-3

3x=-3

=> x = -3:3

=>x = -1

tik nhé 

Answer 2

x+(x+1)+(x+2)+290+291=581

<=> (x + x + x) + ( 1 + 2 + 290 + 291) = 581 

<=> 3x + 584 = 581

<=> 3x = 581 - 584 = -3

<=> x = -1