$\text{( x + 1 ) + ( x + 2 ) + ... + ( x + 100 ) = 7450}$
( x + x + ... + x) + (1+2+3+...+100)= 7450
$\text{100 số hạng}$
$\text{100x + (1 + 100) . 100 : 2 = 7450}$
$\text{100x + 101 . 100 : 2 = 7450}$
$\text{100x + 10100 : 2 = 7450}$
$\text{100x + 5050 = 7450}$
$\text{100x = 7450 - 5050}$
$\text{100x = 2400}$
$\text{x = 2400 : 100
$\text{x = 24}$
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