Dab tsi yog qhov kev nyab xeeb da dej thiab tshuaj ntxuav qhov muag?

Kev nyab xeeb da dej txaus tus nqi yuav tsum ua kom tau raws li qhov xav tau ntawm cov dej txaus kom ntws mus rau qhov chaw cuam tshuam tag nrho.

Da dej yuav tsum muaj tsawg kawg yog 20 nkas loos ib feeb rau tsawg kawg 15 feeb.

Ntxuav qhov muag(nrog rau cov qauv uas muaj tus kheej) yuav tsum muaj qhov tsawg kawg nkaus ntawm 0.4 nkas loos ib feeb.

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