Question

[x+1] + [x+2] + [x+3] + ........+ [x+100] = 5750

Answer 1

(x + 1) + (x + 2) + (x + 3) + .... + (x + 100) = 5750

=> 100x + (1 + 2 + 3 + ... + 100) = 5750

=> 100x + 5050 = 5750

=> 100x = 5750 - 5050

=> 100x = 700

=> x = 700 : 100

=> x = 7 

Answer 2

[x+1] + [x+2] + [x+3] + ........+ [x+100] = 5750

<=>100x +(1+2+3+4+....+100)=5750

<=>100x + (1+100)x50 =5750

<=> 100x + 101x50=5750

<=>100x+5050 = 5750

=>100x= 5750 - 5050

=>100x= 700

=>x=700:100

=>x=7

• Bài viết tham gia Hoa điểm 10 2016 

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