如圖(一),在長度為56的上取一點P。用圈成一個長方形 PMNO,其中 ,再用圍成一個正方形PVUT,如圖(二)。已知時,長方形與正方形的面積和有最小值y,則y=? (A)56 (B)8

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10.如圖(一),在長度為56的上取一點P。用圈成一個長方形 PMNO,其中 ,再用圍成一個正方形PVUT,如圖(二)。已知時,長方形與正方形的面積和有最小值y,則y=?

(A)56
(B)84
(C)112
(D)196

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