Gọi số học sinh của lớp 6 Quận đó là a

a - 4 chia hết cho 22;24;32

22 = 2.11 ; 24 = 2³.3 ; 32 = 2⁵

< = > BCNN(22;24;32) = 2⁵.3.11= 1056

B(1056) = {0 ; 1056 ;2112 ; 3168 ; 4224 ; 5280 ; ....}

a thuộc {4 ; 1060 ; 2116 ; 3172 ; 4228 ; 5284 ; ...}

Vậy số học sinh của quận đó là 4228 em

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