Nyob rau hauv txoj cai hluav taws xob rau kev tsim cov tsev siab siab, lub qhov rooj hluav taws tau teeb tsa raws li a, B, C 3, thiab nws qhov hluav taws kub txwv tsis pub, chav kawm A qhov rooj tsis pub tsawg dua 1.5 teev, chav kawm B qhov rooj yuav tsum tsis txhob tsawg dua 1 teev, chav kawm C qhov rooj yuav tsum tsis pub tsawg tshaj 0.5 teev.

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