Question

Tìm x ,biết

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

Answer 1

=x+1+x+2+x+3+x+4+...+x+100=5750

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

=100x+5050=5750

=>100x=700

=>x=7

Answer 2

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

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

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

(x.100)+5050=5750

x.100=5750-5050

x.100=700

x       =700:100

x       = 7

Vậy x=7

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Answer 3

(x+1)+(x+2)+(x+3)+...+(x+100)
=100.x+(1+2+3,..+100)
=100.x+100.101/2
=>
100x+101.50=5750
100x=5750-5050=700
x=7

Answer 4

(x+1)+(x+2)+(x+3)+...+(x+100)
=100.x+(1+2+3,..+100)
=100.x+100.101/2
=>100x+101.50=5750
100x=5750-5050=700
x=7