tim x biet : x x 6 = 8850
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x(x-2)-3(x+1)=x(x-6)
=>x2-2x-3x-3=x2-6x
=>x2-2x-3x-3-x2+6x=0
=>(x2-x2)+(-2x-3x+6x)-3=0
=>0+x-3=0
=>x=3
x(x-2)-3(x+1)=x(x-6)
=>x2-2x-3x-1=x2-6x
=>x2-2x-3x-1-x2+6x=0
=>(x2-x2)+(-2x-3x+6x)-1=0
=>0+x-1=0
=>x=1
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(x+2)+(x+4)+(x+6)+...+(x+100) = 2700
=> 50x + (2+4+6+...+100) = 2700
=> 50x + 2550 = 2700
=> 50x = 2700 - 2550
=> 50x = 150
=> x = 3
(x+2)+(x+4)+(x+6)+...+(x+100)=2700
>50x+(2+4+6+...+100) =2700
>50x+2550 =2700
>50x =2700-2550
> 50x =150
> x =150:50
>x =3
Vậy X=3 thì (x+2)+(x+4)+(x+6)+...+(x+100) =2700
X x 6 = 8850
x = 8850 : 6
x = 1475
x * 6 = 8850
x = 8850 : 6
x = 1475